adding Unify code generation diff check

[dhchandw]

Added Unify code generation diff check job:

• Clones the Unify SDK
• Regenerates all the ZAP generated files using working branch of ZAP
• Checks for git diff (fails if there is a diff)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.70%. Comparing base (efae34c) to head (ec83e62).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1416      +/-   ##
==========================================
- Coverage   66.86%   66.70%   -0.16%     
==========================================
  Files         191      193       +2     
  Lines       20689    20852     +163     
  Branches     4532     4572      +40     
==========================================
+ Hits        13834    13910      +76     
- Misses       6855     6942      +87     

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