Add a new edebug-breakpoint face

* doc/lispref/edebug.texi (Breakpoints): Mention it.

* lisp/emacs-lisp/edebug.el (edebug-breakpoint): New face.
1 job for master in 90 minutes and 1 second (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #3900
test-all

01:30:01

 
Name Stage Failure
failed
test-all Test The script exceeded the maximum execution time set for the job
  ELC      lisp/mouse-tests.elc
GEN lisp/mouse-tests.log
ELC lisp/net/dbus-tests.elc
GEN lisp/net/dbus-tests.log
ELC lisp/net/gnutls-tests.elc
GEN lisp/net/gnutls-tests.log
ELC lisp/net/mailcap-tests.elc
Pulling docker image gitlab/gitlab-runner-helper:x86_64-d0b76032 ...
ERROR: Job failed: execution took longer than 1h30m0s seconds