Update Testing Actions Documentation to No Longer Reference `inject-loader`#2155

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zhao-li:docs/fix_example_using_inject_loader

Commits on Apr 4, 2022

docs(testing): remove example using mock with `inject-loader` because it no longer works and causes confusion for beginners. Use the existing spy implementation instead.
zhao-li
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docs(testing): add in simplistic Jest example in case it can be helpful
zhao-li
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