Add branch protection support for allow_force_push

[beekeep]

Issue 709 requested the allow_force_push option to be added to the branch protection resource. These changes add that feature, along with the appropriate tests. The API does not support updating the allow force push configuration, so any changes will force a new resource to be created.

Description

Closes #709 . Adds allow_force_push attribute to branch protection resource.

PR Checklist

• Resource attributes match 1:1 the names and structure of the API resource in the GitLab API documentation.
• Examples are updated with:
  • A *.tf file for the resource/s with at least one usage example
  • A *.sh file for the resource/s with an import example (if applicable)
• New resources have at minimum a basic test with three steps:
  • Create the resource
  • Update the attributes
  • Import the resource
• No new //lintignore comments that came from copied code. Linter rules are meant to be enforced on new code.

[github-actions]

Welcome @beekeep 👋

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Thanks again, and welcome to the community! 😃

[beekeep]

@armsnyder , @timofurrer, @nagyv This is ready for your review. Let me know if there is anything I need to change. Thanks!

[timofurrer]

Thanks for the change! Looks good to me!

Comparing with the upstream API I've noticed that we are also missing the allowed_to_unprotect field. I've created #878 - in case you want to implement this in a separate PR 🎉

[beekeep]

@timofurrer I noticed that attribute missing as well, but figured I would keep this PR to just the one attribute. I will get another PR ready to add the allowed_to_unprotect attribute.

[github-actions]

This functionality has been released in v3.10.0 of the Terraform GitLab Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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