feat: Add rule_type parameter to merge_request_approval_rule

[petrmvala]

This is working in the API, and is necessary in order to enable
Eligible Approvers.

Description

#904

PR Checklist Acknowledgement

• I acknowledge that all of the following items are true, where applicable:
  • 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 were copied from existing code. (Linter rules are meant to be enforced on new code.)

[github-actions]

Welcome @petrmvala 👋

It looks like this is your first submission to the Terraform GitLab Provider! If you haven’t already done so, please make sure you have checked out our CONTRIBUTING.md guide to make sure your contribution has all the necessary elements in place for a successful approval.

Thanks again, and welcome to the community! 😃

[timofurrer]

Looks very promising, nice work! I've left a few minor comments.

[timofurrer]

LGTM 🎉

[timofurrer]

@DonNicoJs @armsnyder I've merged this because all checks passed and I've assigned the safe to test label (this is an EE feature) - However, seems like EE tests were not executed and main is now failing :'( Not sure what went wrong here. But I'll try to make main pass again ;)

[github-actions]

This functionality has been released in v3.12.0 of the Terraform GitLab Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue. Thank you!