docs(test-runner-module-mocking): ✏️ test-moduleMocking details on plugin import order

[movrack]

docs(test-runner-module-mocking): ✏️ test-moduleMocking details on plugin import order

Adding details on the order of plugin import in test config. Module mocking must be in first position to avoid conflict with modified path due to other plugins. + refactoring

What I did

1. Adding doc in readme
2. Small refactoring for easiness code view
3. Adding Sinon.js as plugin dep dependency for new test on relative path and try stubbing mocked dependency

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 1cac4c335bb4f458a194048c0440931d6595b28a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@web/test-runner-module-mocking	Patch

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