[docs] Re-generate and fix 9.0.0 release notes in markdown #126425
Merged
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There was an issue our automation related to 9.0.0 having multiple releases (RC/beta) and how changelogs get pruned between releases, resulting in a lot of release notes getting deleted when they should not have been.
This PR adds the release notes back in the new Markdown format, and brings in fixes to formatting/etc as well.