fix: suppress net11 pack warning

[j-d-ha]

Summary

Adds a root Directory.Build.targets pack-time suppression for NU5104 only when a project ships a net11.0 target. This lets stable package versions pack while .NET 11 dependencies are still preview-only.

Changes

• Suppresses NU5104 when TargetFrameworks contains net11.0.
• Keeps suppression scoped to net11-targeting packages instead of globally disabling prerelease dependency validation.

Validation

• Ran dotnet pack --configuration Release --output /tmp/minimal-lambda-pack-test /p:Version=2.6.0 successfully.

Notes for Reviewers

• Existing Directory.Build.props suppression only applied when TargetFramework == net11.0; pack fails in outer-build context where TargetFrameworks is available instead.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main     #361   +/-   ##
=======================================
  Coverage   87.38%   87.38%           
=======================================
  Files         113      113           
  Lines        2814     2814           
  Branches      351      351           
=======================================
  Hits         2459     2459           
  Misses        254      254           
  Partials      101      101           

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