Create pubsub service identity if service is enabled (#270)

* Create  service identity if service is enabled

* remove dry run mode

* fix tests

* Improve for_each logic

tests/cloud_operations/scheduled_asset_inventory_export_bq/test_plan.py

@@ -24,4 +24,4 @@ def test_resources(e2e_plan_runner):
   "Test that plan works and the numbers of resources is as expected."
   modules, resources = e2e_plan_runner(FIXTURES_DIR)
   assert len(modules) == 5
-  assert len(resources) == 18
+  assert len(resources) == 19

tests/data_solutions/data_platform_foundations/test_plan.py

@@ -24,4 +24,4 @@ def test_resources(e2e_plan_runner):
   "Test that plan works and the numbers of resources is as expected."
   modules, resources = e2e_plan_runner(FIXTURES_DIR)
   assert len(modules) == 6
-  assert len(resources) == 32
+  assert len(resources) == 35