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

Apart of the necessary changes on the auth.py file to support this feature, some minor changes were added to this PR, the
.coveragerc file was also added to ignore test files for code coverage, with this change the code coverage went below 80% so a few more tests were added.

Code coverage

---------- coverage: platform darwin, python 3.13.0-final-0 ----------
Name                   Stmts   Miss  Cover   Missing
----------------------------------------------------
auth.py                   28      4    86%   48, 78-80
contributor_stats.py      47     13    72%   58, 142-177
contributors.py           63     20    68%   17-87, 172-173, 190-193, 199
env.py                    53      2    96%   43-44
json_writer.py             5      0   100%
markdown.py               66     13    80%   84, 120, 123-124, 167, 183-193
----------------------------------------------------
TOTAL                    262     52    80%

Required test coverage of 80% reached. Total coverage: 80.15%

Tested against a repository on GHE enterprise the code created a contributors.json and contributors.md file

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 bug, documentation, enhancement, infrastructure, maintenance or breaking

[jmeridth]

Couple things. This looks great. Thank you for the PR.

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