fix: clean up detailed history for CHANGELOG (#1494)

# What does this PR do?

- do not dump all commit history in CHANGELOG
cc @terrytangyuan 

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
```
python scripts/gen-changelog.py
```

[//]: # (## Documentation)
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Xi Yan 2025-03-07 14:03:54 -08:00 committed by GitHub
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commit 9028407386
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2 changed files with 221 additions and 1208 deletions

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