[fxbug.dev] Migrate bug numbers This changes fxbug.dev/ URLs from Monorail bug numbers to the new Fuchsia Issue Tracker numbers. The migration to the new issue tracker was announced here: https://groups.google.com/a/fuchsia.dev/g/announce/c/GOYfJozEqmk/m/qsGsaJ7UAAAJ Bug: 298074672 Change-Id: Ie6e44df0fd641eedd95b7322b4649ed525db8e3d Reviewed-on: https://fuchsia-review.googlesource.com/c/libc-tests/+/980892 Fuchsia-Auto-Submit: Mitchell Kember <mkember@google.com> Reviewed-by: Roland McGrath <mcgrathr@google.com> Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>