Improve quickstart deployment validation

[Steven Ma (stevenjma)]

Summary

• replace automatic privileged PR E2E execution with an authorized maintainer /validate command
• require fresh per-quickstart metadata.json deployment evidence using ARM_CORRELATION_REQUEST_ID
• validate correlated Terraform writes against ARM_Deployments_Terraform_v2
• document the contributor and maintainer workflow

Security model

• authorize /validate before entering the protected environment
• run metadata validation from a trusted default-branch checkout
• never execute PR-controlled code with Azure OIDC credentials
• block non-member changes to the workflow and transitive static-check implementation
• publish terraform-deployment-validation against the exact PR head SHA

Validation

• Python metadata validator unit tests
• Python compilation
• JSON schema parsing
• workflow YAML parsing
• git diff --check
• three focused code-review passes; all findings addressed

Rollout prerequisite

Create the adx-readonly GitHub environment with AZURE_TENANT_ID, AZURE_SUBSCRIPTION_ID, and AZURE_UAMI_CLIENT_ID. Its federated identity needs read-only query access to APAProd on https://apadata.westus.kusto.windows.net.

The issue_comment workflow must exist on the default branch before /validate comments can execute, so end-to-end command testing occurs after merge. Open PRs #499, #498, and #497 are suitable single-quickstart candidates once they add fresh metadata.json evidence.

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