[FEAT]: Support team/user slugs in github_repository_environment reviewers

[edersonbrilhante]

Describe the need

Right now, the github_repository_environment resource only accepts numeric IDs for reviewers:

  reviewers {
    teams = [data.github_user.devops.id]
  }

It would be much easier if it supported team slugs and user logins instead:

reviewers {
  teams = ["devops", "security"]
  users = ["jdoe", "asmith"]
}

This would make configurations more readable and portable, without needing extra data sources like:

data "github_team" "devops" {
  slug = "devops"
}

SDK Version

No response

API Version

No response

Relevant log output

Code of Conduct

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

[stevehipwell]

I think this is related to #2497.

TL;DR - We shouldn't be using team IDs as they're legacy/deprecated, we also need to distinguish between ID and slug as otherwise the API calls make the resource unusable.

What this means for your request is that you'd need to change the API to add team_slugs & user_logins for a non-breaking change.