[confmap] use DeepEqual when using confmap.enableMergeAppendOption

[VihasMakwana]

Description

Equal(..) panics when we're comparing maps. Use reflect.DeepEqual instead. It behaves same way as Equal for types such as int, string, float etc, but compares individual elements for maps as well.

Link to tracking issue

Fixes #12932

Testing

Added a scenario

Documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.69%. Comparing base (c4b6423) to head (53c0a4a).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12952   +/-   ##
=======================================
  Coverage   91.69%   91.69%           
=======================================
  Files         503      503           
  Lines       27550    27555    +5     
=======================================
+ Hits        25262    25267    +5     
  Misses       1808     1808           
  Partials      480      480           

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