fix: show audit logs for forgot password flow (#15181)

Fixes https://github.com/coder/coder/issues/15150

Audit logs for requesting a password reset, and a user updating their
password, now show up in the audit log.

coderd/database/migrations/000268_add_audit_action_request_password_reset.down.sql

@@ -0,0 +1,2 @@
+-- It's not possible to drop enum values from enum types, so the UP has "IF NOT
+-- EXISTS".

coderd/database/migrations/000268_add_audit_action_request_password_reset.up.sql

@@ -0,0 +1,2 @@
+ALTER TYPE audit_action
+  ADD VALUE IF NOT EXISTS 'request_password_reset';