Support separate client side MTLS for production and sandbox endpoints

[RusJaI]

Velocity template update and integration test modifications related to : wso2/api-manager#2433

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 17.64%. Comparing base (b9488e9) to head (612f234).
Report is 10 commits behind head on master.

Files	Patch %	Lines
...ts/publisher/api/v1/dto/ClientCertMetadataDTO.java	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13503      +/-   ##
============================================
+ Coverage     17.43%   17.64%   +0.20%     
- Complexity      872      886      +14     
============================================
  Files           255      255              
  Lines         11518    11518              
  Branches       1201     1201              
============================================
+ Hits           2008     2032      +24     
+ Misses         9493     9469      -24     
  Partials         17       17              

Flag	Coverage Δ
integration_tests	17.64% <33.33%> (+0.20%)	⬆️

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[npamudika]

Let's retrigger the failed builds