[Instrumentation.AspNet] Baggage is propagated before the Activity is created

[Kielek]

Changes

[Instrumentation.AspNet] Baggage is propagated before the Activity is created

It is expected to make implicit context available for the Activity creation context.

Found while working on Baggage related feature in Splunk repo: signalfx/splunk-otel-dotnet#737

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 71.98%. Comparing base (aa94c78) to head (642440c).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3820   +/-   ##
=======================================
  Coverage   71.98%   71.98%           
=======================================
  Files         447      447           
  Lines       17834    17834           
=======================================
  Hits        12838    12838           
  Misses       4996     4996           

Flag	Coverage Δ
unittests-Instrumentation.AspNet	78.49% <100.00%> (ø)

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

Files with missing lines	Coverage Δ
...ation.AspNet.TelemetryHttpModule/ActivityHelper.cs	85.00% <100.00%> (ø)

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