[EntityFrameworkCore] Add schema URL to traces

[martincostello]

Contributes to #4064.

Changes

Add schema URL to the ActivitySource.

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 72.96%. Comparing base (0ecb0b2) to head (a800f30).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4078      +/-   ##
==========================================
+ Coverage   72.83%   72.96%   +0.13%     
==========================================
  Files         460      452       -8     
  Lines       17875    17835      -40     
==========================================
- Hits        13019    13014       -5     
+ Misses       4856     4821      -35     

Flag	Coverage Δ
unittests-Instrumentation.Cassandra	?
unittests-Instrumentation.EntityFrameworkCore	80.95% <100.00%> (+0.15%)	⬆️

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

Files with missing lines	Coverage Δ
...mplementation/EntityFrameworkDiagnosticListener.cs	85.34% <100.00%> (+0.15%)	⬆️
...tyFrameworkCore/TracerProviderBuilderExtensions.cs	100.00% <100.00%> (ø)

... and 8 files with indirect coverage changes

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[Copilot]

Pull request overview

Adds OpenTelemetry schema URL metadata to EntityFrameworkCore instrumentation traces by creating the ActivitySource via the shared factory and updating registration/tests accordingly (contributes to #4064 / #4078).

Changes:

• Create EF Core ActivitySource using ActivitySourceFactory with semantic conventions version 1.36.0 (enables TelemetrySchemaUrl + version).
• Update TracerProviderBuilderExtensions to register the new ActivitySource name.
• Add/extend unit test assertions and update the EF Core instrumentation changelog.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/OpenTelemetry.Instrumentation.EntityFrameworkCore.Tests/EntityFrameworkDiagnosticListenerTests.cs	Asserts ActivitySource name/version/schema URL on exported activities.
src/OpenTelemetry.Instrumentation.EntityFrameworkCore/TracerProviderBuilderExtensions.cs	Registers EF Core instrumentation by ActivitySource name from the new factory-created source.
src/OpenTelemetry.Instrumentation.EntityFrameworkCore/OpenTelemetry.Instrumentation.EntityFrameworkCore.csproj	Links in shared ActivitySourceFactory.cs for schema URL support.
src/OpenTelemetry.Instrumentation.EntityFrameworkCore/Implementation/EntityFrameworkDiagnosticListener.cs	Switches EF Core activity source creation to ActivitySourceFactory and introduces semantic conventions version constant.
src/OpenTelemetry.Instrumentation.EntityFrameworkCore/CHANGELOG.md	Notes addition of schema URL to traces.

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[martincostello]

Need to update to account for OTEL_SEMCONV_STABILITY_OPT_IN.