Exclude swagger-request-validator-core jar

[msm1992]

Fixes wso2/api-manager#4267

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 9.91%. Comparing base (d960d26) to head (e44e71d).
⚠️ Report is 65 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13860      +/-   ##
============================================
- Coverage     19.82%    9.91%   -9.92%     
+ Complexity     1128      629     -499     
============================================
  Files           297      307      +10     
  Lines         14265    14810     +545     
  Branches       1524     1586      +62     
============================================
- Hits           2828     1468    -1360     
- Misses        11405    13324    +1919     
+ Partials         32       18      -14     

Flag	Coverage Δ
integration_tests	9.91% <ø> (-9.92%)	⬇️

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