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

@@             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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