Config list append in overrides

[kozlov721]

Purpose

Makes it easier to append to list using CLI overrides for a config.

Specification

The following syntax is now supported in config overrides:

cofig.list_field.+.new_value

which will append new_value to the list_field.

Dependencies & Potential Impact

None / not applicable

Deployment Plan

None / not applicable

Testing & Validation

None / not applicable

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.30%. Comparing base (64d29f7) to head (0fa0fbc).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #359      +/-   ##
==========================================
+ Coverage   95.26%   95.30%   +0.04%     
==========================================
  Files         103      103              
  Lines        6333     6393      +60     
==========================================
+ Hits         6033     6093      +60     
  Misses        300      300              

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