test: add timeout to PVC deletion wait scripts

Prevent script timeout (5s default) from killing 2m kubectl wait.

Author: sfc-gh-jmckulka

testing/chainsaw/e2e/pgbackrest-restore/chainsaw-test.yaml

@@ -92,6 +92,7 @@ spec:
               kind: PostgresCluster
               name: clone-one
         - script:
+            timeout: 3m
             content: |
               echo "Waiting for clone-one PVCs to be deleted..."
               kubectl wait --for=delete pvc -l postgres-operator.crunchydata.com/cluster=clone-one --timeout=2m || true
@@ -173,6 +174,7 @@ spec:
               kind: PostgresCluster
               name: clone-two
         - script:
+            timeout: 3m
             content: |
               echo "Waiting for clone-two PVCs to be deleted..."
               kubectl wait --for=delete pvc -l postgres-operator.crunchydata.com/cluster=clone-two --timeout=2m || true