Move user-related tables to be gitlab_main_user

There are about 40 tables related to users that are marked as gitlab_main_clusterwide. These tables are not planned to synchronized to other cells in Cells 1.0, so its gitlab_schema should be moved to a different gitlab_main_user schema.

This enables us to differentiate the tables that do need to be synced to other cells.

Implementation

Need to change users related table schema to gitlab_main_user from gitlab_main_clusterwide similar to work done in !188026 (merged), and Draft: Move more tables to `gitlab_main_user` (!192059 - closed)

Some of these tables may be gitlab_main_cell, or gitlab_main_cell_local instead.

=> [["keys", :gitlab_main_clusterwide],
 ["gpg_keys", :gitlab_main_clusterwide],
 ["identities", :gitlab_main_clusterwide],
 ["chat_names", :gitlab_main],
 ["subscriptions", :gitlab_main],
 ["oauth_applications", :gitlab_main_clusterwide],
 ["abuse_reports", :gitlab_main_clusterwide],
 ["abuse_report_assignees", :gitlab_main_clusterwide],
 ["abuse_events", :gitlab_main_clusterwide],
 ["spam_logs", :gitlab_main_clusterwide],
 ["abuse_trust_scores", :gitlab_main_clusterwide],
 ["award_emoji", :gitlab_main],
 ["audit_events", :gitlab_main],
 ["timelogs", :gitlab_main],
 ["resource_label_events", :gitlab_main],
 ["resource_state_events", :gitlab_main],
 ["approvers", :gitlab_main_cell_local],
 ["user_permission_export_uploads", :gitlab_main_clusterwide],
 ["country_access_logs", :gitlab_main_cell_local]]