Change the tests to call product APIs with JWT

[chamilaadhi]

As a part of supporting JWT for portal logins in wso2/api-manager#2496 change the integration test tokens to JWT

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.53%. Comparing base (8b71bbf) to head (e176a41).
Report is 75 commits behind head on master.

❗ Current head e176a41 differs from pull request most recent head b44ab93. Consider uploading reports for the commit b44ab93 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13394      +/-   ##
============================================
- Coverage     20.24%   11.53%   -8.72%     
+ Complexity     1030      588     -442     
============================================
  Files           254      254              
  Lines         11489    11489              
  Branches       1200     1200              
============================================
- Hits           2326     1325    -1001     
- Misses         9134    10148    +1014     
+ Partials         29       16      -13     

Flag	Coverage Δ
integration_tests	11.53% <ø> (-8.72%)	⬇️

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