Allow specifying auto config path

[greenape]

I have:

• [x] Formatted any Python files with black
• [x] Brought the branch up to date with master
• [x] Added any relevant Github labels
• [ ] Added tests for any new additions
• [x] Added or updated any relevant documentation
• [ ] Added an Architectural Decision Record (ADR), if appropriate
• [ ] Added an MPLv2 License Header if appropriate
• [x] Updated the Changelog

Description

Description of what this PR does, and what it changes.

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[cypress[bot]]

Passing run #22877 ↗︎

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Details:

Make the autoconfig filename configurable via env var
Project: FlowAuth	Commit: 5a38c0edff
Status: Passed	Duration: 00:47 💡
Started: Jun 14, 2024 9:01 PM	Ended: Jun 14, 2024 9:02 PM

Review all test suite changes for PR #6601 ↗︎

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.11%. Comparing base (f9efde0) to head (5a38c0e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6601 +/- ## =========================================== - Coverage 92.30% 77.11% -15.20% =========================================== Files 268 268 Lines 10590 10590 Branches 856 856 =========================================== - Hits 9775 8166 -1609 - Misses 676 2169 +1493 - Partials 139 255 +116 ```

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