[MSBUILD SDK] Update official CI to include msbuild sdk. Tweak packaging.

[jviau]

Issue describing the changes in this PR

resolves #issue_for_this_pr

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• I have added all required tests (Unit tests, E2E tests)

Additional information

1. Tweaks official build signing to use minimatch, including Azure.Functions.Sdk in the signing scope
2. Introduces 'msbuild-sdk' as option for official release
3. Tweaks packaging to use FinalOutputPath so that it picks up the signed-in-place dll.
4. Add BuildNumber as VersionSuffix to Azure.Functions.Sdk.

[Copilot]

Pull request overview

Updates the official build/release pipeline to include the new MSBuild SDK package and adjusts packaging so signed outputs are picked up correctly.

Changes:

• Adds msbuild-sdk as a selectable option in the official release pipeline and wires it to Azure.Functions.Sdk publishing.
• Updates official build signing and packing steps to include Azure.Functions.Sdk outputs and packages.
• Adjusts packaging targets to use FinalOutputPath when collecting referenced-project pack files.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/Azure.Functions.Sdk/Azure.Functions.Sdk.csproj	Adds CI-driven VersionSuffix using $(BuildNumber) for the SDK package.
eng/ci/templates/official/jobs/build-artifacts.yml	Expands signing and packing to include MSBuild SDK outputs/packages; consolidates pack step.
eng/ci/official-release.yml	Adds msbuild-sdk release option and package/pattern configuration for Azure.Functions.Sdk.
eng/build/Packaging.targets	Changes referenced-project pack file collection to use FinalOutputPath.

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