[BUG] Add highlighted style for bulk upload error message for columnswith no underscore

[emyl3]

Description

Submit a positive HIV, Syphilis, etc... bulk upload with missing or invalid pregnancy column. A user will not see the styling for column headers.

Steps to reproduce

Discovered by @mpbrown here.

Expected behavior

The same styling for headers with no underscores in the name.

Additional context

The styling is not occurring because of this header regex. But I believe we had that in place to style the following error message correctly:

Invalid ${EQUIPMENT_MODEL_NAME} and ${TEST_PERFORMED_CODE} combination

We need a more robust solution to style all these error messages correctly.