Add labels to pubsub_push_subscription

[Felipe Esteves]

TL;DR

Hello everybody...
We can define topic_labels and subscription_labels but we don't know why we can't define labels for pubsub_push_subscription as well.
It would be very important to have support for the pubsub_push_subscription labels. May be required for IaC policy or compliance reasons.

Terraform Resources

https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/pubsub_subscription

Detailed design

No response

Additional information

Resource:
https://github.com/terraform-google-modules/terraform-google-log-export/blob/master/modules/pubsub/main.tf#L101-L110

Similar implementation:
https://github.com/terraform-google-modules/terraform-google-log-export/blob/master/modules/pubsub/main.tf#L98