[Audit Events] Asynchronous database index addition
What does this MR do and why?
This commit is step 1 to to add a migration to create the
index_audit_events_on_entity_id_and_entity_type_and_created_at
database index asynchronously on GitLab.com.
The synchronous index will be added in the followup #411129 (closed)
related to #337757 (closed)
resolves: #411167 (closed)
Changelog: added
EE: true
MR acceptance checklist
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Edited by Michael Becker