Fix accessibility of build text

* Don't read selected (but it's needed for marquee).
* Replace with a single marquee that's delayed (same as text in tiles).
* Add description for long press action.

Test: manual, using TB
Fixes: 378579618
Flag: EXEMPT bugfix

Change-Id: I0083c24bd7b0ead98ea2f157fa4f411e173d5e12