tests: mark test_partition_move_drop_race as broken

[mkmkme]

It was backported to 25.3 by upstream in the commit 34cc5de. The test requires machinery introduced in 25.8 and therefore is always failing. Mark it as broken to make CI greener.

Changelog category (leave one):

• CI Fix or Improvement (changelog entry is not required)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Mark test_partition_move_drop_race as broken since it requires 25.8+

Documentation entry for user-facing changes

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