chore!: delete old connection events from audit log (#18735)

### Breaking change (changelog note):
>With new connection events appearing in the Connection Log, connection events older than 90 days will now be deleted from the Audit Log. If you require this legacy data, we recommend querying it from the REST API or making a backup of the database/these events before upgrading your Coder deployment. Please see the PR for details on what exactly will be deleted. 
Of note is that there are currently no plans to delete connection events from the Connection Log.


### Context

This is the fifth PR for moving connection events out of the audit log.

In previous PRs:
- **New** connection logs have been routed to the `connection_logs` table. They will *not* appear in the audit log.
- These new connection logs are served from the new `/api/v2/connectionlog` endpoint.

In this PR:
- We'll now clean existing connection events out of the audit log, if they are older than 90 days, We do this in batches of 1000, every 10 minutes.

The criteria for deletion is simple:
```
WHERE
(
     action = 'connect'
     OR action = 'disconnect'
     OR action = 'open'
     OR action = 'close'
)
AND "time" < @before_time::timestamp with time zone
```
where `@before_time` is currently configured to 90 days in the past.


Future PRs:
- Write documentation for the endpoint / feature

coderd/database/queries.sql.go

@@ -566,6 +566,33 @@ func (q *sqlQuerier) CountAuditLogs(ctx context.Context, arg CountAuditLogsParam
 	return count, err
 }
 
+const deleteOldAuditLogConnectionEvents = `-- name: DeleteOldAuditLogConnectionEvents :exec
+DELETE FROM audit_logs
+WHERE id IN (
+    SELECT id FROM audit_logs
+    WHERE
+        (
+            action = 'connect'
+            OR action = 'disconnect'
+            OR action = 'open'
+            OR action = 'close'
+        )
+        AND "time" < $1::timestamp with time zone
+    ORDER BY "time" ASC
+    LIMIT $2
+)
+`
+
+type DeleteOldAuditLogConnectionEventsParams struct {
+	BeforeTime time.Time `db:"before_time" json:"before_time"`
+	LimitCount int32     `db:"limit_count" json:"limit_count"`
+}
+
+func (q *sqlQuerier) DeleteOldAuditLogConnectionEvents(ctx context.Context, arg DeleteOldAuditLogConnectionEventsParams) error {
+	_, err := q.db.ExecContext(ctx, deleteOldAuditLogConnectionEvents, arg.BeforeTime, arg.LimitCount)
+	return err
+}
+
 const getAuditLogsOffset = `-- name: GetAuditLogsOffset :many
 SELECT audit_logs.id, audit_logs.time, audit_logs.user_id, audit_logs.organization_id, audit_logs.ip, audit_logs.user_agent, audit_logs.resource_type, audit_logs.resource_id, audit_logs.resource_target, audit_logs.action, audit_logs.diff, audit_logs.status_code, audit_logs.additional_fields, audit_logs.request_id, audit_logs.resource_icon,
 	-- sqlc.embed(users) would be nice but it does not seem to play well with