Add internal Go extension scaffolding to azd x init

[Copilot]

azd x init did not generate the repo-level files required for first-party extensions under cli/azd/extensions. This adds an internal scaffold path focused on Go extensions.

• CLI

  • Adds azd x init --internal
  • Defaults internal scaffolds to Go and 0.0.1-preview
  • Adds --codeowners for non-interactive CODEOWNERS generation
  • Prompts for CODEOWNERS in interactive internal mode

• Generated internal files

  • Extension-local: ci-build.ps1, ci-test.ps1, version.txt, cspell.yaml
  • Repo-level: .github/workflows/lint-ext-<id>.yml
  • Repo-level: eng/pipelines/release-ext-<id>.yml
  • Updates .github/CODEOWNERS with the extension path

• Safety / scope

  • Restricts --internal to Go extensions for now
  • Requires execution from inside the Azure/azure-dev repo
  • Validates extension IDs before writing repo-level paths

Example:

azd x init --internal --no-prompt \
  --id azure.ai.example \
  --name "Azure AI Example" \
  --namespace ai.example \
  --capabilities custom-commands \
  --codeowners @owner,@Azure/team

[JeffreyCA]

@copilot could we have the template files be separate files instead of being inlined? Like what's in cli/azd/extensions/microsoft.azd.extensions/internal/resources/languages/go/

[Copilot]

@copilot could we have the template files be separate files instead of being inlined? Like what's in cli/azd/extensions/microsoft.azd.extensions/internal/resources/languages/go/

Addressed in b92ef04 by moving the internal scaffold templates into embedded resource files and updating azd x init --internal to load them from there.