feat(compute): add preview disable feature

[davide-zanon]

Description

This pull request creates a method to disallow users from using the alpha API for Compute Engine.

Checklist

Readiness

• Yes, merge this PR after it is approved
• No, don't merge this PR after it is approved

Style

• My sample follows the rules described for Terraform in the Effective Samples style guide
• My sample follows the other requirements and best practices in the Contributing
  guide

Testing

• I have performed tests described in the Contributing guide:

  • Tests pass: terraform apply
  • Lint pass: terraform fmt check

Intended location

• Yes, this sample will be (or already is) included on cloud.google.com
  Location(s): https://cloud.google.com/compute/docs/reference/rest/alpha

• No, this sample won't be included on cloud.google.com
  Reason:

API enablement

• If the sample needs an API enabled to pass testing, I have added the service to the Test setup file

Review

• If this sample adds a new directory, I have added codeowners to the CODEOWNERS file

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• compute/preview_feature/disable/main.tf:17, tag compute_preview_feature_disable

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[hp1100]

LGTM

[davide-zanon]

As in a similar pull request, users might encounter issues due to an organisation policy preventing the CI project from disabling preview features. This is an expected behaviour, and we can therefore disable tests.

For context, see #906 (comment).

[glasnt]

Let's first try /gcbrun to confirm it's a CI issue before adding the testskip

[glasnt]

/gcbrun

[glasnt]

This doesn't require a skip tests, so I won't add it.