[Instrumentation.EntityFrameworkCore] Add component owners

[martincostello]

Fixes #888.

@matt-hensley and I are happy to take on the component ownership for the OpenTelemetry.Instrumentation.EntityFrameworkCore as part of our OpenTelemetry work at Grafana.

Changes

Add component owners for OpenTelemetry.Instrumentation.EntityFrameworkCore.

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)

[Copilot]

Pull Request Overview

Adds the new component owners for the EntityFrameworkCore instrumentation so that contributions and reviews are routed to the correct maintainers.

• Populates the “Code Owners” row in the EF Core README table
• Registers the two GitHub handles in the central component_owners.yml

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/OpenTelemetry.Instrumentation.EntityFrameworkCore/README.md	Added “Code Owners” row with two new maintainers
.github/component_owners.yml	Added martincostello and matt-hensley under the EF Core component

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.65%. Comparing base (71655ce) to head (94d4556).
Report is 879 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2827      +/-   ##
==========================================
- Coverage   73.91%   69.65%   -4.26%     
==========================================
  Files         267      394     +127     
  Lines        9615    15978    +6363     
==========================================
+ Hits         7107    11130    +4023     
- Misses       2508     4848    +2340     

Flag	Coverage Δ
unittests-Contrib.Shared.Tests	86.06% <ø> (?)
unittests-Exporter.Geneva	53.33% <ø> (?)
unittests-Exporter.InfluxDB	95.14% <ø> (?)
unittests-Exporter.Instana	74.86% <ø> (?)
unittests-Exporter.OneCollector	94.61% <ø> (?)
unittests-Exporter.Stackdriver	79.26% <ø> (?)
unittests-Extensions	90.65% <ø> (?)
unittests-Extensions.Enrichment	100.00% <ø> (?)
unittests-Instrumentation.AWS	84.01% <ø> (?)
unittests-Instrumentation.AspNet	76.79% <ø> (?)
unittests-Instrumentation.AspNetCore	70.32% <ø> (?)
unittests-Instrumentation.ConfluentKafka	14.10% <ø> (?)
unittests-Instrumentation.ElasticsearchClient	80.12% <ø> (?)
unittests-Instrumentation.EntityFrameworkCore	57.06% <ø> (?)
unittests-Instrumentation.EventCounters	76.36% <ø> (?)
unittests-Instrumentation.GrpcCore	91.42% <ø> (?)
unittests-Instrumentation.GrpcNetClient	79.61% <ø> (?)
unittests-Instrumentation.Hangfire	93.58% <ø> (?)
unittests-Instrumentation.Http	74.09% <ø> (?)
unittests-Instrumentation.Owin	88.62% <ø> (?)
unittests-Instrumentation.Process	100.00% <ø> (?)
unittests-Instrumentation.Quartz	78.76% <ø> (?)
unittests-Instrumentation.Runtime	100.00% <ø> (?)
unittests-Instrumentation.ServiceFabricRemoting	34.54% <ø> (?)
unittests-Instrumentation.SqlClient	87.82% <ø> (?)
unittests-Instrumentation.StackExchangeRedis	70.92% <ø> (?)
unittests-Instrumentation.Wcf	78.75% <ø> (?)
unittests-PersistentStorage	65.88% <ø> (?)
unittests-Resources.AWS	75.00% <ø> (?)
unittests-Resources.Azure	84.56% <ø> (?)
unittests-Resources.Container	67.34% <ø> (?)
unittests-Resources.Gcp	71.42% <ø> (?)
unittests-Resources.Host	73.91% <ø> (?)
unittests-Resources.OperatingSystem	76.98% <ø> (?)
unittests-Resources.Process	100.00% <ø> (?)
unittests-Resources.ProcessRuntime	78.26% <ø> (?)
unittests-Sampler.AWS	88.25% <ø> (?)

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see 394 files with indirect coverage changes

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