Add integration test for audience validation with API and API products

[BiyonFernando]

Purpose

To add integration tests for audience validation support feature described in [1].

[1] - wso2/api-manager#2784

Approach

The audience property is included to the schemas in the publish-api.yaml. Integration tests are written for the following scenarios to test the functionality of audience validation support with APIs and API products:

• Test the response for a GET request without enabling audience validation.
• Test blocking the response when an invalid audience is provided.
• Test whether the response passes through when a valid audience is provided.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 17.83%. Comparing base (2d070f7) to head (b36568c).
Report is 25 commits behind head on master.

Files	Patch %	Lines
...lients/publisher/api/v1/dto/APIProductInfoDTO.java	60.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13520      +/-   ##
============================================
+ Coverage     17.52%   17.83%   +0.30%     
- Complexity      879      897      +18     
============================================
  Files           255      255              
  Lines         11526    11551      +25     
  Branches       1202     1204       +2     
============================================
+ Hits           2020     2060      +40     
+ Misses         9490     9474      -16     
- Partials         16       17       +1     

Flag	Coverage Δ
integration_tests	17.83% <60.00%> (+0.30%)	⬆️

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