Merge latest Library.Template

[AArnott]

• Use safer ToLower variant for package IDs
• Update NuGet/login action to v1.2.0 (512)
• Ignore C# Dev Kit generated cache files
• Update Microsoft Testing Platform to 2.2.2 (514)
• Update dependency nerdbank.dotnetrepotools to v1.4.1 (515)
• Update Dockerfile and global.json updates to v10.0.300 (516)

[Copilot]

Pull request overview

Updates this repo to align with the latest Library.Template by tightening culture-invariant behavior in tooling scripts and bumping several pinned toolchain/dependency versions.

Changes:

• Use ToLowerInvariant() when normalizing NuGet package IDs in the download helper script.
• Update pinned versions for .NET SDK (global.json), Microsoft Testing Platform, and nerdbank.dotnetrepotools.
• Ignore C# Dev Kit cache artifacts (*.lscache) in .gitignore.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tools/Download-NuGetPackage.ps1	Uses culture-invariant lowercasing for consistent package folder paths across locales.
global.json	Bumps pinned .NET SDK version to 10.0.300.
Directory.Packages.props	Updates MicrosoftTestingPlatformVersion to 2.2.2 for centrally-managed package versions.
.gitignore	Adds ignore rule for C# Dev Kit cache files (*.lscache).
.config/dotnet-tools.json	Updates nerdbank.dotnetrepotools tool version to 1.4.1.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.88%. Comparing base (9327f11) to head (6c4c1ba).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #363   +/-   ##
=======================================
  Coverage   77.88%   77.88%           
=======================================
  Files          14       14           
  Lines         859      859           
  Branches      224      224           
=======================================
  Hits          669      669           
  Misses        126      126           
  Partials       64       64           

Flag	Coverage Δ
Linux	79.18% <ø> (ø)
Windows	77.88% <ø> (ø)

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