Merge latest Library.Template

[AArnott]

• Update actions/checkout action to v6 (443)
• Use official URLs in Install-DotNetSdk.ps1
• Update dependency xunit.v3 to 3.2.1 (445)
• Switch out our own OptProf profiling pipeline for the VS one
• Merge pull request 447 to Build on newer agents
• Update actions/checkout digest to 8e8c483 (448)
• Update actions/checkout digest
• Build on VS2026 agents
• Better pinning of GitHub Actions
• Update actions/checkout action to v6.0.1 (449)
• Exclude vs-insertion-script.ps1 from signing requirement
• Update actions/deploy-pages action to v4.0.5 (450)
• Skip SBOM generation for the vs-insertion pipeline
• Remove stray backtick from README
• Update NuGet/login action to v1.1.0 (451)
• Remove vs-threading specific change
• Remove stale comment
• Update actions/checkout action to v6.0.1
• Fix alignment of sbom parameter
• Fix template expansion
• Opt into Microsoft Testing Platform (MTP)
• Push to nuget.org before pushing to github release
• Update to MTP v2
• Update all MTP related packages at once (457)
• Fix test result publishing to AzDO (458)
• Update .NET SDK to v10.0.101
• Drop package dependencies that MTP does not require
• Fix MTP test failure for MTP-incompatible projects under the test folder

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.29%. Comparing base (805fa7e) to head (9b738b6).

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #333       +/-   ##
===========================================
- Coverage   93.84%   80.29%   -13.55%     
===========================================
  Files          21       11       -10     
  Lines        1007      401      -606     
  Branches      216      111      -105     
===========================================
- Hits          945      322      -623     
+ Misses         62       59        -3     
- Partials        0       20       +20     

Flag	Coverage Δ
Linux	83.60% <ø> (-8.94%)	⬇️
Windows	80.29% <ø> (-13.55%)	⬇️

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