UI: remove failure group placeholder from commit header
UI: remove failure group placeholder from commit header

It will be more useful to use this space to display a prefix of the
commit description and maybe the author email and maybe a list of tags
indicating which LLVM subproject was edited.

googleinterns/step240-2020,googleinterns/step240-2020,googleinterns/step240-2020,googleinterns/step240-2020