Add integration tests for GraphQL API creation using SDL URL and Endp…

[nisan-abeywickrama]

Purpose

Add integration tests for the new functionality developed to create GraphQL APIs using:

1. SDL URL: Create APIs from schema URLs.
2. Endpoint: Create APIs by introspecting GraphQL endpoints.

Implementation

• New Tests:
  • testCreateGraphQLAPIUsingSDLURL
  • testCreateGraphQLAPIUsingEndpoint
• WireMock: Mock SDL URL and introspection responses using a wire mock server for testing.
• Update rest api calls and methods to include the new url and useIntrospection parameters.

Related to issue: wso2/api-manager#3444

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 14.43%. Comparing base (b7456cf) to head (8e5cae1).
Report is 21 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13623      +/-   ##
============================================
- Coverage     18.44%   14.43%   -4.02%     
+ Complexity      944      719     -225     
============================================
  Files           261      261              
  Lines         12045    12084      +39     
  Branches       1262     1266       +4     
============================================
- Hits           2222     1744     -478     
- Misses         9806    10314     +508     
- Partials         17       26       +9     

Flag	Coverage Δ
integration_tests	14.43% <ø> (-4.02%)	⬇️

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