feat: add headers for tenantID and clientRequestID

[jwtty]

Description of your changes

Set headers for tenantID and clientRequestID in attributeBasedVMSizeRecommender client

Fixes #

I have:

• Run make reviewable to ensure this PR is ready for review.

How has this code been tested

Tested in standalone with a test client: 88caa9

fleet-hub-agent deployment is updated with environment vars:

- name: CAPACITY_ENDPOINT
  value: http://msi-connector.msi-connector.svc.cluster.local/compute
- name: AZURE_TENANT_ID
  value: 72f988bf-86f1-41af-91ab-2d7cd011db47

VMSize recommendation is successfully generated:

I1119 22:21:04.587280       1 hubagent/main.go:185] "Capacity client created successfully" endpoint="http://msi-connector.msi-connector.svc.cluster.local/compute" client={}
I1119 22:21:04.587506       1 hubagent/main.go:199] "Sending GenerateAttributeBasedRecommendations request" request="subscription_id:\"8ecadfc9-d1a3-4ea4-b844-0d9f87e4d7c8\"  location:\"eastus2\"  regular_priority_profile:{target_capacity:4}  resource_properties:{vm_attributes:{allowed_vm_sizes:\"Standard_D2s_v3\"  allowed_vm_sizes:\"Standard_D4s_v3\"}}"
I1119 22:21:04.587582       1 compute/vmsizerecommenderclient.go:118] "Generating VM size recommendations" subscriptionID="8ecadfc9-d1a3-4ea4-b844-0d9f87e4d7c8" location="eastus2" clientRequestID="f4543bef-b235-4b26-b9a0-bc30602d219e"
I1119 22:21:17.498671       1 compute/vmsizerecommenderclient.go:124] "Generated VM size recommendations" subscriptionID="8ecadfc9-d1a3-4ea4-b844-0d9f87e4d7c8" location="eastus2" clientRequestID="f4543bef-b235-4b26-b9a0-bc30602d219e" latency=12911
I1119 22:21:17.498736       1 hubagent/main.go:204] "Received recommendations" response="recommended_vm_sizes:{regular_vm_sizes:{family:\"D\"  name:\"Standard_D2s_v3\"  size:\"D2s_v3\"}  regular_vm_sizes:{family:\"D\"  name:\"Standard_D4s_v3\"  size:\"D4s_v3\"}}"

clientRequestID is properly passed to compute-svc too:

{
  "clientRequestID": "951fa8db-88a7-4ed9-b463-d6ec470546dd",
  "env_epoch": "AONLD",
  "fileName": "pkg/compute/svc/vmsizerecommender_service.go",
  "level": "info",
  "lineNumber": 123,
  "msg": "Generating attribute-based VM size recommendations",
  "region": "eastus2",
  "resourceGroupName": "",
  "resourceName": "",
  "serviceBuild": "omitted",
  "source": "fleetcomputeconnectorcontextactivity",
  "spanID": "38b048fb9a8957cc",
  "subscriptionID": "8ecadfc9-d1a3-4ea4-b844-0d9f87e4d7c8",
  "time": "2025-11-18T23:46:06Z",
  "traceID": "042f8c8ea378d0aaf4ce038cd179542b"
}
{
  "clientRequestID": "951fa8db-88a7-4ed9-b463-d6ec470546dd",
  "env_epoch": "AONLD",
  "fileName": "pkg/compute/svc/vmsizerecommender_service.go",
  "level": "info",
  "lineNumber": 144,
  "msg": "Successfully generated attribute-based VM size recommendations",
  "region": "eastus2",
  "resourceGroupName": "",
  "resourceName": "",
  "serviceBuild": "omitted",
  "source": "fleetcomputeconnectorcontextactivity",
  "spanID": "38b048fb9a8957cc",
  "subscriptionID": "8ecadfc9-d1a3-4ea4-b844-0d9f87e4d7c8",
  "time": "2025-11-18T23:46:11Z",
  "traceID": "042f8c8ea378d0aaf4ce038cd179542b"
}

Special notes for your reviewer

[britaniar]

LGTM

[ryanzhang-oss]

just curious, who set this env?

[jwtty]

The env var will be set in the fleet-hub-agent chart.