Since the edk2 repository is owned by an organization, the default
GitHub token will not be able to access the collaborator list.
Therefore, a GitHub App with `metadata:read` permission will be used
to grant access to that REST API. This is used in GitHub.py when it
makes the `repo_gh.get_collaborators()` call that resolves to the
`/repos/{owner}/{repo}/collaborators` GitHub REST API.
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
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