Merge branch '463929-declare-keys-table-gitlab_main_clusterwide' into 'master'

Declare 'keys' table to be gitlab_main_clusterwide

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/169357



Merged-by: Adam Hegyi <ahegyi@gitlab.com>
Approved-by: Doug Stull <dstull@gitlab.com>
Approved-by: Adam Hegyi <ahegyi@gitlab.com>
Reviewed-by: Doug Stull <dstull@gitlab.com>
Co-authored-by: Kerri Miller <kerrizor@kerrizor.com>