Image auditor test cases

This snapshot aims to cover multipleuse cases for the "Missing alt text" auditor. The following should be flagged:

Case 1: Image on canvas, empty alt text from asset

Case 2: Bound image in Collection, unbound/undefined alt text

Case 3: Bound image in Collection, empty bound alt text

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Case 4: Image in Rich Text Element, empty alt text from asset

[Not yet] Case 5: Bound image in Rich Text Element in Collection, empty alt text

Case 6: Bound multi-image field, empty alt text

No items found.
No items found.

The following should be skipped:

Image is marked as descriptive