feat: support github enterprise api

[ricardojdsilva87]

Pull Request

Proposed Changes

This Pull request is based on the already merged github/evergreen#256 to give support to GitHub Enterprise login using a GitHub App also created on GitHub Enterprise

• Split the authentication to a separate file
• Added needed tests

Code coverage

---------- coverage: platform darwin, python 3.13.0-final-0 ----------
Name             Stmts   Miss  Cover   Missing
----------------------------------------------
auth.py             16      1    94%   47
stale_repos.py     151     16    89%   142-143, 184-185, 200-201, 224, 326, 328, 335-336, 394-395, 402-403, 413
----------------------------------------------
TOTAL              167     17    90%

Required test coverage of 80% reached. Total coverage: 89.82%

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request
• run make lint and fix any issues that you have introduced
• run make test and ensure you have test coverage for the lines you are introducing
• If publishing new data to the public (scorecards, security scan results, code quality results, live dashboards, etc.), please request review from @jeffrey-luszcz

Reviewer

• Label as either fix, documentation, enhancement, infrastructure, maintenance or breaking

[jmeridth]

One import question. Nice break out of the auth content.

[jmeridth]

why do we need this?

[ricardojdsilva87]

Hello @jmeridth,
I've tried this because of this error on the pipeline:
https://github.com/github/stale-repos/actions/runs/11576316507/job/32229613440#step:5:38
It seems that it's not the best approach since it still fails. I haven't looked into the other repositories to check what might be the difference because the code between them is the same

[zkoppert]

I think it may be time to drop support for python v3.9 like we have for our other actions.