allow github_actions_runner_group to be created with RestrictedToWorkflows and SelectedWorkflows

[bob-bins]

Resolves #1332

---

Behavior

Before the change?

• The first PR that closed Support workflow restrictions in github_actions_runner_group #1332 missed code that allows the user to create a GitHub Runner Group with the new fields

After the change?

The user is able to create github_actions_runner_group with restricted_to_workflows and selected_workflows specified.

Other information

• I am unable to run the tests for this resource because I do not have a personal GitHub Enterprise Account. It would be great if someone with an account could test this PR

---

Additional info

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Added the appropriate label for the given change

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes (Please add the Type: Breaking change label)
• No

If Yes, what's the impact:

• N/A

Pull request type

Please add the corresponding label for change this PR introduces:

• Bugfix: Type: Bug
• Feature/model/API additions: Type: Feature
• Updates to docs or samples: Type: Documentation
• Dependencies/code cleanup: Type: Maintenance

---

[kfcampbell]

I don't have an enterprise account that I can use for this either, unfortunately. I need to figure out how to do that.

Would you be interested in merging as-is?

[bob-bins]

I would be okay with merging as-is, assuming you or someone else familiar with this part of the codebase did a sanity check, just cause this one updates the input argument reference in the user-facing docs!