pick: show abort message after pick is aborted for consistency

Other commands, like evolve, rebase and graft, show such a message after
they've already been aborted, and this is also an opportunity to use the common
"wdir is now at" message.
8 jobs for topic/default/ui-labels in 7 minutes and 13 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed checks-py2 #198177

00:01:48

passed checks-py3 #198178

00:01:04

passed doc #198183

00:02:03

manual pytype #198176
allowed to fail manual
passed tests-py2-cext #198179

00:04:27

passed tests-py2-pure #198180

00:03:53

passed tests-py3-cext #198181

00:07:11

passed tests-py3-pure #198182

00:06:30