Fix google_app_engine_flexible_app_version.service_account permadiff (#…

…6747)

* Update compute_security_policy documentation for type field

Documentation updated for the type field to be in sync with the API docs located at https://cloud.google.com/compute/docs/reference/rest/v1/securityPolicies

* Update compute_security_policy documentation for type field

Documentation updated for the 'type' field to be in sync with the API docs located at https://cloud.google.com/compute/docs/reference/rest/v1/securityPolicies

* Add default_from_api:true flag to serviceAccount under FlexibleAppVersion in AppEngine

* Add default_from_api:true flag to serviceAccount under FlexibleAppVersion in AppEngine

mmv1/products/appengine/terraform.yaml

@@ -123,6 +123,8 @@ overrides: !ruby/object:Overrides::ResourceOverrides
           Environment variables available to the application.  As these are not returned
           in the API request, Terraform will not detect any changes made outside of the Terraform config.
         ignore_read: true
+      serviceAccount: !ruby/object:Overrides::Terraform::PropertyOverride
+        default_from_api: true
       network.subnetworkName: !ruby/object:Overrides::Terraform::PropertyOverride
         name: 'subnetwork'
       betaSettings: !ruby/object:Overrides::Terraform::PropertyOverride