v26.25.0 release notes

[bosconi]

For included items with PR links see: https://github.com/MaterializeInc/mz-skills/blob/auto/release-notes-v26.25.0/data/mz-release-notes/v26.25.0/release_notes.md

For omitted items with PR links see: https://github.com/MaterializeInc/mz-skills/blob/auto/release-notes-v26.25.0/data/mz-release-notes/v26.25.0/omitted.md

Borderline PRs omitted: 13 — review borderline calls

[github-actions]

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