chore(integration test): prevent eventual consistency issue in TestServer_Limits_AuditLogRetention (#10608)

# Which Problems Are Solved

The TestServer_Limits_AuditLogRetention is too reliant on time
constraints when checking that a limit is correctly applied. IN case it
takes to long to do all the preparation, there won't be any events to
read and the test will fail.

# How the Problems Are Solved

Don't require any events to be returned.

# Additional Changes

None

# Additional Context

- Noted a lot of pipeline to fail on this step.
- requires backport to at least v4.x

(cherry picked from commit 8574d6fbab)

internal/api/grpc/system/integration_test/limits_auditlogretention_test.go

@@ -43,7 +43,7 @@ func TestServer_Limits_AuditLogRetention(t *testing.T) {
 	var limitedCounts *eventCounts
 	requireEventually(t, iamOwnerCtx, isoInstance.Client, userID, projectID, appID, projectGrantID, func(c assert.TestingT, counts *eventCounts) {
 		counts.assertAll(c, "limited events < added events", assert.Less, addedCount)
-		counts.assertAll(c, "limited events > 0", assert.Greater, zeroCounts)
+		counts.assertAll(c, "limited events >= 0", assert.GreaterOrEqual, zeroCounts)
 		limitedCounts = counts
 	}, "wait for limited event assertions to pass")
 	listedEvents, err := isoInstance.Client.Admin.ListEvents(iamOwnerCtx, &admin.ListEventsRequest{CreationDateFilter: &admin.ListEventsRequest_From{