gh-team-allowlist does not work with nested groups

[ben-dov]

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Overview of the Issue

gh-team-allowlist does not work with nested groups. Important to note, because of issue #3627, I am using the environment variable ATLANTIS_GH_TEAM_ALLOWLIST instead. If this is not a bug but intended (not sure why), then the docs should mention it.

Reproduction Steps

1. create two Github groups A and B.
2. add group B under A.
3. have a user named C, and add him to group B.
4. add permission for group A to run atlantis plan (using ATLANTIS_GH_TEAM_ALLOWLIST).
5. try to run atlantis plan from a PR using user C (it will fail because of permissions).
6. add user C to group A (directly).
7. try to run atlantis plan from a PR using user C (it will succeed).

Additional Context

Atlantis version: 0.23.1