Fix LT-22632: Show # of changed analyses in Run Tests report

[jtmaxwell3]

This implements https://jira.sil.org/browse/LT-22632. It adds a column that reports the number of analyses that changed since the last time that a word was parsed. This is only meaningful if Updates Word Analyses is disabled, so it hides the column if it is enabled. This is useful if you are trying to speed up a grammar without changing any of the analyses. Then you can

1. Parse a corpus to establish a baseline.
2. Disable Updates Word Analyses.
3. Make changes to the grammar.
4. Invoke Run tests on the corpus.
5. Verify that the number of changed analyses is zero for the corpus.
6. Verify that the corpus parses faster.
7. Go to step 3.

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This change is 

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   11m 8s ⏱️ -1s
4 313 tests ±0  4 240 ✅ ±0  73 💤 ±0  0 ❌ ±0 
4 322 runs  ±0  4 249 ✅ ±0  73 💤 ±0  0 ❌ ±0 

Results for commit 9ac58c0. ± Comparison against base commit 7176e6c.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 88.63636% with 5 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@2e3576f). Learn more about missing BASE report.
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
Src/LexText/ParserCore/ParserReport.cs	88.63%	1 Missing and 4 partials ⚠️

Additional details and impacted files

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  Files           ?     1202           
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  Hits            ?    91926           
  Misses          ?   158499           
  Partials        ?    27854           

Files with missing lines	Coverage Δ
Src/LexText/ParserCore/ParserReport.cs	67.88% <88.63%> (ø)

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