Add feature can_admins_bypass for repo environments | fixed wait_timer issue for repo environments

[scott-doyland-burrows]

For resource github_repository_environment

Resolves https://github.com/integrations/terraform-provider-github/issues/1804 can_admins_bypass implemented

Resolves https://github.com/integrations/terraform-provider-github/issues/1996 wait_timer issue fixed

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Before the change?

can_admins_bypass was not implemented for repository environments.

wait_timer would not show a diff if updated outside of terraform.

After the change?

can_admins_bypass is implemented.

wait_timer correctly shows a diff if updated outside of terraform.

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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