Uncomment [ContentType("text")] attribute and unskip integration test #64567
Description
See #62877 (comment) for details
This issue tracks uncommenting [ContentType("text")] attribute and un-skipping the integration test added for this feature once AB#1639743 has been fixed.
Revert 0a13f58 to address this issue. c891363 refactored the code, so this would need more than just a revert.