Environment webhook payload does not match between versioning v1 and v2

[matthewelwell]

The payloads for the environment webhooks between environments that do / don't have feature versioning enabled are quite significantly different. See examples below:

feature versioning: false

{
  "data": {
    "changed_by": "matthew.elwell@flagsmith.com",
    "new_state": {
      "enabled": false,
      "environment": {
        "id": 26252,
        "name": "Production"
      },
      "feature": {
        "created_date": "2025-10-22T15:38:08.185108Z",
        "default_enabled": false,
        "description": null,
        "id": 167664,
        "initial_value": "control",
        "name": "mv_feature",
        "project": {
          "id": 10349,
          "name": "Another project"
        },
        "type": "MULTIVARIATE"
      },
      "feature_segment": null,
      "feature_state_value": "control",
      "identity": null,
      "identity_identifier": null
    },
    "previous_state": {
      "enabled": false,
      "environment": {
        "id": 26252,
        "name": "Production"
      },
      "feature": {
        "created_date": "2025-10-22T15:38:08.185108Z",
        "default_enabled": false,
        "description": null,
        "id": 167664,
        "initial_value": "control",
        "name": "mv_feature",
        "project": {
          "id": 10349,
          "name": "Another project"
        },
        "type": "MULTIVARIATE"
      },
      "feature_segment": null,
      "feature_state_value": "control",
      "identity": null,
      "identity_identifier": null
    },
    "timestamp": "2025-10-22T15:40:00.603011Z"
  },
  "event_type": "FLAG_UPDATED"
}

feature versioning: true

{
  "data": {
    "feature": {
      "id": 167664,
      "name": "mv_feature"
    },
    "feature_states": [
      {
        "enabled": false,
        "value": "control"
      }
    ],
    "published_by": {
      "email": "matthew.elwell@flagsmith.com",
      "id": 1
    },
    "uuid": "9f16c893-88ae-4d6d-a9ac-19bbe02e6f01"
  },
  "event_type": "NEW_VERSION_PUBLISHED"
}

[gagantrivedi]

The plan is to trigger FLAG_UPDATED for features in the same way, irrespective of whether versioning is enabled or not, and not to change the schema of NEW_VERSION_PUBLISHED

[gagantrivedi]

Related issue: #6241