gfs2: Set .migrate_folio in gfs2_{rgrp,meta}_aops

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DEBIAN-CVE-2025-39753

In the Linux kernel, the following vulnerability has been resolved: gfs2: Set .migratefolio in gfs2rgrp,metaaops Clears up the warning added in 7ee3647243e5 "migrate: Remove call to -writepage" that occurs in various xfstests, causing "something found in dmesg" failures. 341.136573 gfs2metaaops...