Use fixed namespace for kuttl tests

kajinamit · kajinamit · commit 828e7867ab4f · 2023-07-20T16:34:06.000+09:00
... instead of auto-created one.
diff --git a/kuttl-test.yaml b/kuttl-test.yaml
@@ -18,6 +18,7 @@ apiVersion: kuttl.dev/v1beta1
 kind: TestSuite
 reportFormat: JSON
 reportName: kuttl-test-mariadb
+namespace: mariadb-kuttl-tests
 timeout: 180
 parallel: 2
 suppress:
