Fix: error if column names are duplicated

[ea-rus]

Description

Duplicated column names lead to setting wrong type of column in from_df (it becomes series)

Type of change

• 🐛 Bug fix (non-breaking change which fixes an issue)

Verification Process

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• Test Location: Specify the URL or path for testing.
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Additional Media:

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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.