[release] Core stable release 1.19.0 updates

[otelbot-dotnet]

Note: This PR was opened automatically by the post-release workflow.

Merge once packages are available on NuGet and the build passes.

Changes

• Sets OTelLatestStableVer in Directory.Packages.props to 1.19.0.

[opentelemetry-pr-dashboard]

Pull request dashboard status

Merged · refreshed 2026-09-18 17:14 UTC

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.84%. Comparing base (dac1573) to head (f4df316).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7785      +/-   ##
==========================================
- Coverage   91.88%   91.84%   -0.04%     
==========================================
  Files         339      339              
  Lines       18539    18539              
==========================================
- Hits        17034    17027       -7     
- Misses       1505     1512       +7     

Flag	Coverage Δ
unittests-PowerShellScripts	87.43% <ø> (ø)
unittests-Project-Experimental	91.95% <ø> (-0.02%)	⬇️
unittests-Project-Stable	91.91% <ø> (-0.08%)	⬇️
unittests-Solution	91.90% <ø> (-0.06%)	⬇️
unittests-UnstableCoreLibraries-Experimental	50.74% <ø> (-0.11%)	⬇️

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see 3 files with indirect coverage changes