refactor(typescript): move test helper functionality in a new package · apimatic/apimatic-js-runtime@9dbf6ac

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File '/home/runner/work/apimatic-js-runtime/apimatic-js-runtime/packages/test-helper/src/testHelper.ts' is not under 'rootDir' '/home/runner/work/apimatic-js-runtime/apimatic-js-runtime/packages/core/src'. 'rootDir' is expected to contain all source files.

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