ci(lts): print commit subjects instead of hash

Where the script used to print hashes, it will now print commit subject
line. Hashes made sense when the script was first created as a
prototype. Now since we will be working with uncommitted patches, hashes
don't hold useful info.

Signed-off-by: Okash Khawaja <okash@google.com>
Change-Id: I07f16f946d865f6a8c3cfb6903000c1bcc73f592
2 files changed