docs: release notes for the v19.2.24 release

[dgp1130]

Cherry-picks the changelog from the "19.2.x" branch to the next branch (main).

[gemini-code-assist]

Code Review

This pull request updates the CHANGELOG.md by adding a new entry for version 19.2.24 and applying minor formatting adjustments to existing sections. A review comment points out that the new version entry and the CHANGELOG SPLIT MARKER are incorrectly positioned at the top of the file, which breaks the descending version order relative to version 22.0.0-next.5 and may disrupt automated release processes.

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CHANGELOG.md (1-11)

The CHANGELOG SPLIT MARKER and the new release entry for 19.2.24 are being placed at the very top of the file, above the existing 22.0.0-next.5 entry. This presents two issues:

1. Version Order: Changelog entries should follow a descending version order. Since 22.0.0-next.5 is a higher version, it should remain at the top of the main branch changelog.
2. Split Marker: This marker is typically used by automated release scripts to determine where to truncate or archive the changelog. Placing it here will likely cause the 22.0.0-next.5 entry and all subsequent history to be incorrectly archived or omitted from the primary changelog view.

Please move the 19.2.24 section to its correct chronological/versioned position and ensure the split marker is not incorrectly placed above newer versions.