feat: add Azure NetworkLoadBalancerProbe adapter (#4402)

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## Summary

Adds a new Azure adapter for Load Balancer Probes
(`NetworkLoadBalancerProbe`). Probes are child resources of Load
Balancers that define health check configurations for backend pool
members.

## Changes

- **Client interface**
(`sources/azure/clients/load-balancer-probes-client.go`): New
`LoadBalancerProbesClient` interface wrapping
`armnetwork.LoadBalancerProbesClient` with `Get` and `NewListPager`
methods
- **Mock**
(`sources/azure/shared/mocks/mock_load_balancer_probes_client.go`):
Generated mock for unit testing
- **Adapter** (`sources/azure/manual/network-load-balancer-probe.go`):
`SearchableWrapper` implementation with:
- `Get(scope, loadBalancerName, probeName)` - retrieves a specific probe
- `Search(scope, loadBalancerName)` - lists all probes under a load
balancer
  - `SearchStream` - streaming variant of Search
  - Health status mapping from provisioning state
  - Linked items: parent LoadBalancer (GET), LoadBalancingRules (GET)
- **Registration** (`sources/azure/manual/adapters.go`): Registered in
both init and placeholder blocks
- **Unit tests**
(`sources/azure/manual/network-load-balancer-probe_test.go`):
Comprehensive tests including Get, Search, StaticTests, error handling,
empty name validation, nil name handling
- **Integration test**
(`sources/azure/integration-tests/network-load-balancer-probe_test.go`):
Full Setup/Run/Teardown test against live Azure APIs

## Bidirectional Links

The parent `NetworkLoadBalancer` adapter already links to probes via GET
(iterating `Properties.Probes`) and includes `NetworkLoadBalancerProbe`
in `PotentialLinks()`. The child probe adapter links back to the parent
via GET. Both directions are tested.

## Self-Review Checklist

- [x] **IAMPermissions**: Present, references
`Microsoft.Network/loadBalancers/probes/read`
- [x] **PredefinedRole**: Present, uses `Reader`
- [x] **LinkedItemQueries**: 2 link types verified (parent LoadBalancer
GET, LoadBalancingRules GET). No IP/DNS fields in Probe struct.
- [x] **PotentialLinks**: 2 types listed (`NetworkLoadBalancer`,
`NetworkLoadBalancerLoadBalancingRule`), matches LinkedItemQueries
- [x] **Unit tests**: All passing (Get, Get_WithInsufficientQueryParts,
Get_WithEmptyLoadBalancerName, Get_WithEmptyProbeName, Search,
Search_WithNilName, Search_InvalidQueryParts,
Search_WithEmptyLoadBalancerName, ErrorHandling_Get,
ErrorHandling_Search, Get_NoProperties, StaticTests)
- [x] **Integration test**: All sub-tests passing (Setup, Run/GetProbe,
Run/SearchProbes, Run/VerifyLinkedItems, Run/VerifyItemAttributes,
Teardown) against live Azure APIs

All checklist items passed. Ready for review.
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---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Lionel Wilson <Lionel-Wilson@users.noreply.github.com>
GitOrigin-RevId: c44110ae2ba31335086570b41a867ca262fdde88

Author: 2 people

sources/azure/clients/load-balancer-probes-client.go

@@ -0,0 +1,32 @@
+package clients
+
+import (
+	"context"
+
+	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork/v9"
+)
+
+//go:generate mockgen -destination=../shared/mocks/mock_load_balancer_probes_client.go -package=mocks -source=load-balancer-probes-client.go
+
+type LoadBalancerProbesPager = Pager[armnetwork.LoadBalancerProbesClientListResponse]
+
+type LoadBalancerProbesClient interface {
+	Get(ctx context.Context, resourceGroupName string, loadBalancerName string, probeName string) (armnetwork.LoadBalancerProbesClientGetResponse, error)
+	NewListPager(resourceGroupName string, loadBalancerName string) LoadBalancerProbesPager
+}
+
+type loadBalancerProbesClient struct {
+	client *armnetwork.LoadBalancerProbesClient
+}
+
+func (a *loadBalancerProbesClient) Get(ctx context.Context, resourceGroupName string, loadBalancerName string, probeName string) (armnetwork.LoadBalancerProbesClientGetResponse, error) {
+	return a.client.Get(ctx, resourceGroupName, loadBalancerName, probeName, nil)
+}
+
+func (a *loadBalancerProbesClient) NewListPager(resourceGroupName string, loadBalancerName string) LoadBalancerProbesPager {
+	return a.client.NewListPager(resourceGroupName, loadBalancerName, nil)
+}
+
+func NewLoadBalancerProbesClient(client *armnetwork.LoadBalancerProbesClient) LoadBalancerProbesClient {
+	return &loadBalancerProbesClient{client: client}
+}