test: Update assertions

Airflow 3.2 changes "migrating" to "migration"

Author: NickLarsenNZ

tests/templates/kuttl/cluster-operation/09-assert.yaml

@@ -5,4 +5,4 @@ kind: TestAssert
 timeout: 30
 commands:
 - script: |
-    kubectl -n $NAMESPACE logs airflow-scheduler-default-0 | grep "Database migrating done!"
+    kubectl -n $NAMESPACE logs airflow-scheduler-default-0 | grep -E "Database migrat(ing|ion) done!"

tests/templates/kuttl/cluster-operation/31-assert.yaml

@@ -5,4 +5,4 @@ kind: TestAssert
 timeout: 30
 commands:
 - script: |
-    kubectl -n $NAMESPACE logs airflow-scheduler-default-0 | grep "Database migrating done!" && exit 1 || exit 0
+    kubectl -n $NAMESPACE logs airflow-scheduler-default-0 | grep -E "Database migrat(ing|ion) done!" && exit 1 || exit 0