Merge latest Library.Template

[AArnott]

• Update becheran/mlc action to v0.22.0
• Pin actions/checkout
• Update xunit
• Update Dockerfile and global.json updates to v9.0.301 (#376)
• Add copilot swe agent setup instructions (#377)
• Touch-up name of github workflow
• Bump MicroBuild to 2.0.198
• Enable PME signing for Library.Template
• Fix expand-template.yml indentation
• Focus binskim on just the binaries we build
• Build for OptProf with test signed bits
• Update mcr.microsoft.com/dotnet/sdk:9.0.301-noble Docker digest to 21cd104 (#379)
• Update mcr.microsoft.com/dotnet/sdk:9.0.301-noble Docker digest to f353951 (#380)
• Update dependency powershell to 7.5.2
• Re-enable static graph nuget restore
• Update becheran/mlc action to v1 (#383)
• Update mcr.microsoft.com/dotnet/sdk:9.0.301-noble Docker digest to 2346351 (#382)
• Update mcr.microsoft.com/dotnet/sdk:9.0.301-noble Docker digest to 4fd7d3e (#384)