fix mysql integration tests

[subodh1810]

Issue : #5368
After we introduced validation for config objects in the PR #4699 , the mysql source publish and integration tests have been broken. Which also means the validation changes have not been published for mysql source yet

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[subodh1810]

/test connector=source-mysql

🕑 source-mysql https://github.com/airbytehq/airbyte/actions/runs/1124132879
✅ source-mysql https://github.com/airbytehq/airbyte/actions/runs/1124132879