fix(v2): config validation fixes + add tests for config validation #3142
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Motivation
This PR adds tests for config validation, especially for the validation bugs that were fixed in PR #3120. This helps to make the Joi validation less prone to errors.
I've also allowed empty string for some fields so that the validation is not unnecessarily strict.
Have you read the Contributing Guidelines on pull requests?
Yes
Test Plan
Automated tests
Related PRs
This is related to the validation bugs in #3120.