[buganizer] Migrate DIR_METADATA in third_party Migrate all DIR_METADATA in third_party with folder starting with a*. Verify components with http://b/components/{id} or at go/chrome-on-buganizer-prod-components. Bug: chromium:1518875 Change-Id: I2b8d95a709dc9707d401b3230ff31c3e0c12d36e Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5288114 Reviewed-by: Rick Byers <[email protected]> Commit-Queue: Jeff Yoon <[email protected]> Cr-Commit-Position: refs/heads/main@{#1259391} NOKEYCHECK=True GitOrigin-RevId: 639aaa414cb016670b57cddee1438da5bcb0a1ae