[CLDGR-748] Adding capacity operations for ns update

[pauloh-temporal]

Why?

We want to support update capacity operations for provisioned capacity of a namespace

Checklist

1. Closes CLDGR-748

2. How was this tested:

./tcld --server "saas-api.tmprl-test.cloud:443" namespace uc -n capacity-test.temporal-dev --cm provisioned --cv 16
{
        "asyncOperation": {
                "id": "7cbe07a6-6eb6-45ba-883a-0e6930b5f2a6",
                "stateDeprecated": "pending",
                "state": "StatePending",
                "checkDuration": "10s",
                "operationType": "UpdateNamespace",
                "operationInput": {
                        "@type": "type.googleapis.com/temporal.api.cloud.cloudservice.v1.UpdateNamespaceRequest",
                        "namespace": "capacity-test.temporal-dev",
                        "spec": {
                                "name": "capacity-test",
                                "regions": [
                                        "aws-us-west-2"
                                ],
                                "retentionDays": 30,
                                "mtlsAuth": {
                                        "acceptedClientCaDeprecated": "",
                                        "acceptedClientCa": null,
                                        "certificateFilters": [
                                        ],
                                        "enabled": false
                                },
                                "apiKeyAuth": {
                                        "enabled": true
                                },
                                "customSearchAttributes": {
                                },
                                "searchAttributes": {
                                },
                                "codecServer": {
                                        "endpoint": "",
                                        "passAccessToken": false,
                                        "includeCrossOriginCredentials": false,
                                        "customErrorMessage": {
                                                "default": {
                                                        "message": "",
                                                        "link": ""
                                                }
                                        }
                                },
                                "lifecycle": {
                                        "enableDeleteProtection": false
                                },
                                "highAvailability": {
                                        "disableManagedFailover": false
                                },
                                "connectivityRuleIds": [
                                ],
                                "capacitySpec": {
                                        "provisioned": {
                                                "value": 16
                                        }
                                }
                        },
                        "resourceVersion": "95cbfc62-c1f2-45ba-9f61-00ad8dfd1ee5",
                        "asyncOperationId": ""
                },
                "failureReason": "",
                "startedTime": "2025-09-23T21:39:28Z",
                "finishedTime": null,
                "approval": null
        }
}

./tcld --server "saas-api.tmprl-test.cloud:443" namespace g -n capacity-test.temporal-dev
{
        "namespace": "capacity-test.temporal-dev",
        "resourceVersion": "cd74f5ec-8360-461c-b548-09651320aef7",
        "spec": {
                "name": "capacity-test",
                "regions": [
                        "aws-us-west-2"
                ],
                "retentionDays": 30,
                "mtlsAuth": {
                        "acceptedClientCaDeprecated": "",
                        "acceptedClientCa": null,
                        "certificateFilters": [
                        ],
                        "enabled": false
                },
                "apiKeyAuth": {
                        "enabled": true
                },
                "customSearchAttributes": {
                },
                "searchAttributes": {
                },
                "codecServer": {
                        "endpoint": "",
                        "passAccessToken": false,
                        "includeCrossOriginCredentials": false,
                        "customErrorMessage": {
                                "default": {
                                        "message": "",
                                        "link": ""
                                }
                        }
                },
                "lifecycle": {
                        "enableDeleteProtection": false
                },
                "highAvailability": {
                        "disableManagedFailover": false
                },
                "connectivityRuleIds": [
                ],
                "capacitySpec": {
                        "provisioned": {
                                "value": 16
                        }
                }
        },
        "stateDeprecated": "active",
        "state": "Active",
        "asyncOperationId": "",
        "endpoints": {
                "webAddress": "https://capacity-test.temporal-dev.web.tmprl-test.cloud",
                "mtlsGrpcAddress": "",
                "grpcAddress": "us-west-2.aws.api.tmprl-test.cloud:7233"
        },
        "activeRegion": "aws-us-west-2",
        "limits": {
                "actionsPerSecondLimit": 400
        },
        "privateConnectivities": [
        ],
        "createdTime": "2025-09-23T21:27:00Z",
        "lastModifiedTime": "2025-09-23T21:39:35Z",
        "regionStatus": {
        },
        "connectivityRules": [
        ],
        "tags": {
        },
        "capacity": {
                "provisioned": {
                        "currentValue": 16
                },
                "latestRequest": {
                        "state": "StateCapacityRequestCompleted",
                        "startTime": "2025-09-23T21:39:30.392664427Z",
                        "endTime": "2025-09-23T21:39:34.492232573Z",
                        "asyncOperationId": "7cbe07a6-6eb6-45ba-883a-0e6930b5f2a6",
                        "spec": {
                                "provisioned": {
                                        "value": 16
                                }
                        }
                }
        }
}

3. Any docs updates needed?