[OpenTelemetry] Refactor Lambda expressions

[martincostello]

Changes

• Hoist condition out of lambda to only evaluate it once.
• Simplify delegate declaration.

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 86.89%. Comparing base (496e4ac) to head (63f7bae).
⚠️ Report is 12 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6852      +/-   ##
==========================================
- Coverage   86.90%   86.89%   -0.01%     
==========================================
  Files         263      263              
  Lines       12382    12381       -1     
==========================================
- Hits        10761    10759       -2     
- Misses       1621     1622       +1     

Flag	Coverage Δ
unittests-Project-Experimental	86.76% <100.00%> (+0.04%)	⬆️
unittests-Project-Stable	86.70% <100.00%> (-0.13%)	⬇️

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

Files with missing lines	Coverage Δ
src/OpenTelemetry/Trace/TracerProviderSdk.cs	99.35% <100.00%> (-0.01%)	⬇️

... and 1 file with indirect coverage changes

[Copilot]

Pull request overview

This PR refactors lambda expressions in the TracerProviderSdk for better performance and code clarity. The changes optimize conditional evaluation and simplify delegate declarations without altering the functional behavior.

Changes:

• Simplified lambda expression in Any() method using method group conversion
• Hoisted supportLegacyActivity condition check out of lambda to evaluate once at assignment time instead of on every invocation

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