Revert "Promote ExtraText lint warning to an error"

This reverts commit 7868b9e9.

Reason for revert: DroidMonitor: Potential culprit for Bug b/242013483 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Bug: 242013483
Change-Id: Ib73f862f34ca2c8ede7e4b4b9403d1eed00d0426