feat: add data sources github_actions_remove_token and github_actions_organization_remove_token

[dankress]

Resolves #2696

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Before the change?

• Data source github_actions_remove_token didn't exist
• Data Source github_actions_organization_remove_token didn't exist
• Test for github_actions_registration_token does not work, because for new repo creation vulnerability_alerts is automatically activated, which is not reflected in tests, leading to immediate drift

After the change?

• Data source github_actions_remove_token lets you create a self-hosted runner remove token at the repository level
• Data source github_actions_organization_remove_token lets you create a self-hosted runner remove token at the organization level
• Implemented tests for github_actions_remove_token and github_actions_organization_remove_token similar to tests for github_actions_registration_token and github_actions_organization_registration_token
• Fixed test for github_actions_registration_token, by registering of test repo with activated vulnerability alerts
• Added documentation similar to github_actions_registration_token and github_actions_organization_registration_token

Pull request checklist

• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• [ ] Yes
• [x] No

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[diofeher]

Thanks for the submission @dankress! We'll be holding this PR for the next v7 release. We will release this one as an ephemeral resource.

[dankress]

Great to see my contribution being put to use, looking forward to the release!