Fix parsing configuration for TraceIdRatioBasedSampler on non standard locales + fix localization related test

[hannahhaering]

Fixes: #6451

Some tests failed on machines using another localization (decimal separator for numbers). I noticed this running the tests locally on a German Windows 11 machine. I tried to fix this by using culture specific test data and making the parsing of config values culture invariant.

Changes

• The TracerProviderSdk now parses a double value from configuration (TraceIdRatio) using InvariantCulture instead of the CurrentCulture.
• Some tests tried to override the current culture before making assertions. This did not work because the string was already generated at this point of time. Also, this approach can lead to race conditions when running multiple tests in parallel, so I removed it.

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)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: hannahhaering / name: Hannah Haering (c6beb5d, 8c8e159, da0b031, 8492fb5, 7613a0f, 811045b, 5d988f6)
• ✅ login: Kielek / name: Piotr Kiełkowicz (5cb21e3, 23e3112, 410d460, 6cc1f2c, dd0d3fa, 52f52db, c52c5f7)
• ✅ login: rajkumar-rangaraj / name: Rajkumar Rangaraj (915969f)
• ✅ login: theletterf / name: Fabrizio Ferri-Benedetti (c52c5f7)

[Kielek]

LGTM, you can consider CHANGELOG entry to cover this parsing fix.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.68%. Comparing base (ea2cfdc) to head (915969f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6444   +/-   ##
=======================================
  Coverage   86.68%   86.68%           
=======================================
  Files         258      258           
  Lines       11878    11878           
=======================================
  Hits        10296    10296           
  Misses       1582     1582           

Flag	Coverage Δ
unittests-Project-Experimental	86.56% <100.00%> (+0.20%)	⬆️
unittests-Project-Stable	86.29% <100.00%> (-0.26%)	⬇️

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	99.36% <100.00%> (ø)

... and 6 files with indirect coverage changes

[github-actions]

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