Add tests for registry modules

[tahzeer]

• g2p_enumerator
• mts_connector
• g2p_mts
• g2p_bank_rest_api
• g2p_registry_rest_api (models)
• g2p_registry_rest_api (routers)
• g2p_agent_portal_base
• g2p_registration_portal_base

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.38%. Comparing base (a0ec1d1) to head (32a1ff5).

Additional details and impacted files

@@             Coverage Diff              @@
##           17.0-1.4     #223      +/-   ##
============================================
+ Coverage     71.39%   74.38%   +2.99%     
============================================
  Files           197      204       +7     
  Lines          4999     5157     +158     
  Branches        579      579              
============================================
+ Hits           3569     3836     +267     
+ Misses         1315     1189     -126     
- Partials        115      132      +17     

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