[FEAT]: Add support for deployment protection rules

[cailen]

Describe the need

I propose support be added for deployment protection rules, specifically custom deployment protection rules. This was implemented in go-github here (google/go-github#3050). This allows for Github Apps configured with the correct permissions to be used as a gate for Github Environment deployments. The only resources I currently see as of v6.2.1 are:

• github_repository_environment_deployment_policy - This only sets policies for what branch is allowed to deploy a specific environment.
• github_repository_environment - This only allows you to set who is allows to review a specific environment and toggles for if it can only be deployed on protected branches or custom branch policies defined in github_repository_environment_deployment_policy.

Documentation:

• https://docs.github.com/en/enterprise-cloud@latest/actions/deployment/protecting-deployments/creating-custom-deployment-protection-rules
• https://docs.github.com/en/enterprise-cloud@latest/actions/deployment/protecting-deployments/configuring-custom-deployment-protection-rules

API:

• https://docs.github.com/en/enterprise-cloud@latest/rest/deployments/protection-rules?apiVersion=2022-11-28

go-github:

• https://github.com/google/go-github/blob/master/github/repos_deployment_protection_rules.go

Thanks!

SDK Version

go-github v59.0.0+; terraform-provider-github v6.2.1

API Version

REST 2022-11-28

Relevant log output

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[cailen]

#2188 would resolve the go-github version.