Remove unused `CODEOWNERS.hold` file (#64299)

Super stale at this point, so let's remove it for now until we revisit a
codeowners file here


Release Notes:

- N/A
3c82de747dFinn Evers committed on 9/16/2026, 1:18:20 PM· committed by GitHubparent5c9efb7
1 file changedLine totals unavailable