Reduces search clipping when work profile is not present.

Basically, adds the spacing that is otherwise included by
the tab protection (which is about 4dp less than the spacing
that was previously being added).

Adds a compile-time flag to render the header at all times to
help visualize issues like this in the future. Check the
screenshots below to see some examples of this.

Screenshots: https://drive.google.com/drive/folders/1n4wwtjMwOR-eDIE1xAoG3oLXO7txpoT_?resourcekey=0-WP0RNbp7vFh2Yw1wUBZTaA&usp=sharing

Bug: 240672593
Bug: 243728487
Test: Manually checked search transition, scrolling behavior, and
highlight of the search results with and without a work profile.

Change-Id: I166d136e568c5621c81378fa09021666d95f0ffc