[chore] Add missing chloggen component types

[evan-bradley]

Description

A lot of our modules are missing metadata.yaml files, which are used by githubgen to determine which modules are available to be put in the list of components eligible for a changelog entry.

There were also two extension/xextension entries that were in my opinion misclassified packages, so I fixed those as well.

[evan-bradley]

This test is a holdover from when mdatagen was hosted in contrib. The Git blame on this shows it hasn't been touched since it was copied to core.

The test doesn't make any sense for this repo (the callout components in allowedMetrics are contrib components), so I think we're better off just removing it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.82%. Comparing base (95aacc1) to head (464b6f1).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14626      +/-   ##
==========================================
- Coverage   91.83%   91.82%   -0.01%     
==========================================
  Files         679      679              
  Lines       42921    42921              
==========================================
- Hits        39415    39411       -4     
- Misses       2438     2440       +2     
- Partials     1068     1070       +2     

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[evan-bradley]

Build passes, I think this is ready to merge.

[codspeed-hq]

Merging this PR will improve performance by 27.66%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚡ 2 improved benchmarks
✅ 59 untouched benchmarks
⏩ 20 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	BenchmarkMetricsToProto2k	91.4 µs	73.1 µs	+25.11%
⚡	BenchmarkTraceSizeSpanCount	60 ns	47 ns	+27.66%

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_{Comparing evan-bradley:add-chloggen-components (464b6f1) with main (6dd7ac8)}

Footnotes

1. 20 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩