Update schema to gitlab_main_clusterwide for instance wide tables

db/docs/audit_events_instance_amazon_s3_configurations.yml

...dit_events_instance_external_audit_event_destinations.yml

...t_events_instance_google_cloud_logging_configurations.yml

...udit_events_streaming_http_instance_namespace_filters.yml

...cs/audit_events_streaming_instance_event_type_filters.yml

db/docs/instance_audit_events_streaming_headers.yml

...ab/database/no_new_tables_with_gitlab_main_schema_spec.rb