Fix failing MySQL API tets

[ZoranPandovski]

Description

This PR fixes the failing tests due to MySQL api returning column names in uppercase like "STATUS" and "NAME" but the tests checked for lowercase "status" and "name", causing all checks to fail and tests to loop until timeout instead of detecting when models finished training.
To avoid scenarios like this for now, I am normalizing the values in lowercase always.

Type of change

(Please delete options that are not relevant)

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ⚡ New feature (non-breaking change which adds functionality)
• 📢 Breaking change (fix or feature that would cause existing functionality not to work as expected)
• 📄 This change requires a documentation update

Checklist:

• My code follows the style guidelines(PEP 8) of MindsDB.
• I have appropriately commented on my code, especially in complex areas.
• Necessary documentation updates are either made or tracked in issues.
• Relevant unit and integration tests are updated or added.

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