Add support for network tags in Autopilot clusters and NAP node pools

[modular-magician]

Hey, I took a stab at adding support for network tags on Autopilot clusters and NAP node pools. The placement and naming of the field were a bit tricky since the same API is used for both Autopilot and NAP, but I'm open to suggestions.

I also added a pair of new acceptance tests to go along with it that I believe should pass, but I haven't been able to run them since they violate my company's org-level GCP constraints. I did however do manual tests provisioning/updating autopilot clusters and they were successful. I expect NAP clusters should work fine given it's the same API call, but I wanted to get the PR submitted for comments and to make sure the acceptance tests run successfully.

fixes hashicorp/terraform-provider-google#11051

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

container: added field `auto_provisioning_network_tags` to `google_container_cluster` (beta)

Derived from GoogleCloudPlatform/magic-modules#6133