[release] Core stable release 1.11.0 updates

[opentelemetrybot]

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 1.11.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.38%. Comparing base (3d1f74d) to head (5b1a5ec).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6064   +/-   ##
=======================================
  Coverage   86.38%   86.38%           
=======================================
  Files         257      257           
  Lines       11679    11679           
=======================================
  Hits        10089    10089           
  Misses       1590     1590