Added support for auto and deprecated automatic field in google_secret_manager_secret resource

[modular-magician]

Added support for the auto field and deprecated automatic field in the google_secret_manager_secret resource
fixes hashicorp/terraform-provider-google#10679
fixes hashicorp/terraform-provider-google#9272
fixes hashicorp/terraform-provider-google#14282

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).
• 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).
• Generated Terraform providers, and ran make test and make lint in the generated providers to ensure it passes unit and linter tests.
• Ran relevant acceptance tests using my own Google Cloud project and credentials (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read Write release notes before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

secretmanager: added `auto` field to `google_secret_manager_secret` resource

secretmanager: deprecated `automatic` field on `google_secret_manager_secret`. Use `auto` instead.

Derived from GoogleCloudPlatform/magic-modules#8838