Add hierarchical namespace support to GCS module (#2712)

* Add hierarchical namespace support to GCS module

* remove empty iap block from inventories

* Fix tests

* Add new hns inventory

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Co-authored-by: Ludo <ludomagno@google.com>

tests/modules/cloudsql_instance/examples/simple.yaml

@@ -28,7 +28,6 @@ values:
       advanced_machine_features: []
       availability_type: ZONAL
       collation: null
-      data_cache_config: []
       database_flags: []
       deletion_protection_enabled: false
       deny_maintenance_period: []