fix: ApplicationSource.Equal return false negative (#18632)

[nattawitc]

Fixes: #18632

go's standard JSON library escape all HTML special character which cause Equal function to return false when comparing escaped and unescaped characters.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.65%. Comparing base (b909993) to head (a8feae1).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #18970   +/-   ##
=======================================
  Coverage   50.64%   50.65%           
=======================================
  Files         315      315           
  Lines       43286    43295    +9     
=======================================
+ Hits        21924    21929    +5     
- Misses      18859    18865    +6     
+ Partials     2503     2501    -2     

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