Take all files from baselineProfiles for library

All files with any names are now pick up for merge from
baselineProfiles folder.

Only file with name baseline-prof.txt was being picked up
before the fix.

Few invariants stay the same:
- All files will be merged in one profile with \n as a delimiter.
- Simple syntax check happens during file merge.
- Order of merge is not stable.

Bug: 469127532
Test: ArtProfileSingleLibraryTest updated
Change-Id: I808586841ef8ab3d2b67a24e6b0243a89015cce2