Read mirror config via the config server

[jacob720]

Fixes #1512

Instructions to reviewer on how to test:

1. Check config is read through the config server

Checks for reviewer

• Would the PR title make sense to a user on a set of release notes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.29%. Comparing base (327c161) to head (3b54dfe).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1513   +/-   ##
=======================================
  Coverage   92.29%   92.29%           
=======================================
  Files         142      142           
  Lines        8094     8094           
=======================================
  Hits         7470     7470           
  Misses        624      624           

Components	Coverage Δ
i24 SSX	78.56% <ø> (ø)
hyperion	97.93% <100.00%> (ø)
other	98.08% <ø> (ø)

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[DominicOram]

Great, thank you!