Password for initial_user for AlloyDB is now rquired

Details: https://github.com/GoogleCloudPlatform/magic-modules/pull/15596

Note: as of now, validation doesn't allow `known after apply` values for
passwords

tests/modules/alloydb/examples/cmek.yaml

@@ -24,7 +24,9 @@ values:
     deletion_policy: DEFAULT
     display_name: primary
     etag: null
-    initial_user: []
+    initial_user:
+    - password: changeit
+      user: postgres
     labels: null
     location: europe-west8
     maintenance_update_policy: []

tests/modules/alloydb/examples/cross_region_replication.yaml

@@ -26,7 +26,9 @@ values:
     display_name: db
     encryption_config: []
     etag: null
-    initial_user: []
+    initial_user:
+    - password: changeit
+      user: postgres
     labels: null
     location: europe-west8
     maintenance_update_policy: []

tests/modules/alloydb/examples/custom.yaml

@@ -26,7 +26,9 @@ values:
     display_name: primary
     encryption_config: []
     etag: null
-    initial_user: []
+    initial_user:
+    - password: changeit
+      user: postgres
     labels: null
     location: europe-west8
     maintenance_update_policy: []

tests/modules/alloydb/examples/psc.yaml

@@ -27,7 +27,9 @@ values:
     display_name: db
     encryption_config: []
     etag: null
-    initial_user: []
+    initial_user:
+    - password: changeit
+      user: postgres
     labels: null
     location: europe-west8
     maintenance_update_policy: []

tests/modules/alloydb/examples/read_pool.yaml

@@ -26,7 +26,9 @@ values:
     display_name: db
     encryption_config: []
     etag: null
-    initial_user: []
+    initial_user:
+    - password: changeit
+      user: postgres
     labels: null
     location: europe-west8
     maintenance_update_policy: []

tests/modules/alloydb/examples/simple.yaml

@@ -26,7 +26,9 @@ values:
     display_name: db
     encryption_config: []
     etag: null
-    initial_user: []
+    initial_user:
+    - password: changeit
+      user: postgres
     labels: null
     location: europe-west8
     maintenance_update_policy: []