[OpenTelemetry] Use config source generator

[martincostello]

Fixes #4725

Changes

Use the configuration binding source generator where available to avoid need to suppress native AoT warnings.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.68%. Comparing base (e7a801e) to head (d2ebf07).
⚠️ Report is 32 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6587      +/-   ##
==========================================
+ Coverage   86.65%   86.68%   +0.02%     
==========================================
  Files         258      258              
  Lines       11910    11910              
==========================================
+ Hits        10321    10324       +3     
+ Misses       1589     1586       -3     

Flag	Coverage Δ
unittests-Project-Experimental	86.55% <ø> (-0.08%)	⬇️
unittests-Project-Stable	86.51% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...try/Logs/ILogger/OpenTelemetryLoggingExtensions.cs	97.43% <ø> (ø)

... and 3 files with indirect coverage changes

[martincostello]

Looks like this isn't as simple as "remove suppressions and turn on the binder source generator" - will need to do further investigation.

[github-actions]

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