Introduce option to disable diagnostic tool

[arunans23]

$subject

Resolves wso2/api-manager#2773

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 24.42%. Comparing base (a984da2) to head (b09c153).
Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13465      +/-   ##
============================================
+ Coverage     24.32%   24.42%   +0.10%     
- Complexity     1243     1251       +8     
============================================
  Files           254      254              
  Lines         11495    11495              
  Branches       1200     1200              
============================================
+ Hits           2796     2808      +12     
+ Misses         8672     8660      -12     
  Partials         27       27              

Flag	Coverage Δ
integration_tests	24.42% <ø> (+0.10%)	⬆️

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