Rename ComposableTraceIdRatioBased to ComposableProbability

[anuraaga]

Rename the composible ratio sampler to match the new name in the spec

https://opentelemetry.io/docs/specs/otel/trace/sdk/#composableprobability

This doesn't touch the top-level, where TraceIdRatio has a new development spec to output deprecation warnings - I think this will need to be implemented when the spec is marked stable, though not sure.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.17%. Comparing base (18780a3) to head (0d77a1f).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7786   +/-   ##
=========================================
  Coverage     90.17%   90.17%           
  Complexity     7189     7189           
=========================================
  Files           814      814           
  Lines         21730    21730           
  Branches       2129     2129           
=========================================
  Hits          19594    19594           
  Misses         1467     1467           
  Partials        669      669           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.