Make sb-image.el obsolete (Bug#37837)

* lisp/sb-image.el: Move from here...
* lisp/obsolete/sb-image.el: ...to here.

* lisp/speedbar.el (ezimage): Require instead of 'sb-image'.
(speedbar-use-images, speedbar-expand-image-button-alist)
(speedbar-insert-image-button-maybe, speedbar-image-dump): Move
here from 'sb-image.el'.
1 job for master in 90 minutes and 2 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #4789
test-all

01:30:02

 
Name Stage Failure
failed
test-all Test The script exceeded the maximum execution time set for the job
make -C test check-expensive
make[1]: Entering directory '/builds/emacs/emacs/test'
rm -f ./*.tmp
make[2]: Entering directory '/builds/emacs/emacs/test'
make[3]: Entering directory '/builds/emacs/emacs/test'
ELC lisp/net/tramp-tests.elc
GEN lisp/net/tramp-tests.log
Pulling docker image gitlab/gitlab-runner-helper:x86_64-d0b76032 ...
ERROR: Job failed: execution took longer than 1h30m0s seconds