CSV Import: Skip companion columns during field inference

[triozer]

Description

This pull request adds support for skipping companion columns during CSV import field inference. Specifically, it ignores columns with the :alt suffix (e.g., Image:alt), which provide alt text for corresponding fields like Image. This prevents these companion columns from being incorrectly inferred as separate fields.

Testing

• Test CSV import with companion columns
  • In a new project add the default Blog collection
  • Use the CMS Export plugin to get the CSV
  • Update an image alt
  • Use the CSV Import plugin to import the CSV
  • Verify that only the Image field is inferred, and you do not see Image:alt anymore
  • Import and verify that the alt is updated

[triozer]

• CSV Import: Skip companion columns during field inference #532 👈 (View in Graphite)
• main

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