Limit audit events controller to 31 days date range

Problem to solve

Prompted by @huzaifaiftikhar1's question I noticed that the maximum date range of 31 days for filtering audit events [docs] is only enforced in the frontend and not in the backend in our audit events controllers. This means that a user can select a range of more than 31 days by editing the URL query.

Screenshot

[GDK_HOST]/admin/audit_logs?created_after=2021-06-01&created_before=2021-10-31

Suggested solution

Update the audit events controller to enforce the maximum date range of 31 days.

Implementation guide

• Update audit events controllers (instance, group, project)
• Update controller specs