Table name validation not working when extracting a column

[ghislaineguerin]

Description

There's an issue with table name validation when creating them via "Extract Columns to Table".

When the table is created from scratch it will show a warning in the table creation form. However that warning is not showing here and it generates an error on save:

Once the invalid name table is saved the entire schema can't be accessed:

Expected behavior

Mathesar should prevent errors in table creation by warning about invalid characters.

To Reproduce

Go to Mathesar:

• Attempt to create a new table by extracting a column.
• Use an invalid character in the name.

[kgodey]

This should be handled by the backend refactor, we'll double check before the beta is out.