Add feedBaseUrl passthrough to 1ES build pipeline parameters

[Copilot]

This updates the repo’s 1ES build pipeline to pass feedBaseUrl into the shared Azure DevOps template as part of the private-feed migration Phase A. The change is additive and preserves existing npmFeed behavior.

• Pipeline parameter wiring

  • Updated .config/build.yml under extends.parameters to include feedBaseUrl from shared variables.
  • Kept npmFeed unchanged and present.

• Resulting parameter block

  extends:
    template: azdo-pipelines/1es-mb-main.yml@azExtTemplates
    parameters:
      npmFeed: ${{ variables.npmFeed }}
      feedBaseUrl: ${{ variables.feedBaseUrl }}

[Copilot]

Pull request overview

This PR updates the Azure DevOps 1ES build pipeline (.config/build.yml) to also pass through feedBaseUrl from the shared azcode.variables.yml template into the shared 1es-mb-main.yml template, supporting the private-feed migration while preserving existing npmFeed wiring.

Changes:

• Added feedBaseUrl: ${{ variables.feedBaseUrl }} under extends.parameters in the 1ES build pipeline.
• Kept existing npmFeed: ${{ variables.npmFeed }} behavior unchanged.

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