Simplify vs-insertion pipelines: remove obsolete rel/dX.Y branch logic

[Copilot]

Context

The VS repo no longer uses rel/dX.Y target branches. All insertions from main and vs* servicing branches should target main in VS. The AutoInsertTargetBranch had a ~30-line conditional mapping each vsX.Y → rel/dX.Y that is now dead code.

Changes Made

vs-insertion.yml:

• Replace AutoInsertTargetBranch conditional chain with value: 'main' — auto always targets main
• Trim TargetBranch parameter to auto/main/rel/insiders/rel/stable
• Keep vs* resource trigger (MSBuild still has those branches)
• Remove obsolete InsertPackagePropsValues conditional for old servicing branches (17.x Microsoft.Build.Engine/Conversion.Core additions, 17.10/17.12/17.14 PackageProps logic)

vs-insertion-experimental.yml:

• Trim TargetBranch parameter to main/rel/insiders/rel/stable
• Remove exp/vsX.Y regex detection — auto-triggered builds always target main

Testing

Pipeline YAML only — no code changes.

Notes

The $props array construction is retained even though InsertPackagePropsValues is always unset, in case it's needed for future servicing.

[Copilot]

Pull request overview

This PR simplifies the VS insertion pipeline definitions by removing obsolete rel/dX.Y targeting logic now that insertions should no longer map vsX.Y branches to rel/dX.Y branches in VS.

Changes:

• Hard-code auto insertion target to main and reduce TargetBranch parameter options.
• Remove legacy InsertPackagePropsValues branch-condition logic in vs-insertion.yml.
• Remove experimental exp/vsX.Y branch regex detection so auto-triggered experimental insertions always target main.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
azure-pipelines/vs-insertion.yml	Simplifies auto target branch selection and removes legacy servicing-branch PackageProps logic.
azure-pipelines/vs-insertion-experimental.yml	Reduces target branch options and removes version-detection logic for auto-triggered runs.

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