Improve remote file notifications

Improve remote file notifications

* lisp/net/tramp-sh.el (tramp-get-remote-gio-file-monitor): Remove it.
(tramp-sh-handle-file-notify-add-watch): Do not call it.
(tramp-sh-gio-monitor-process-filter): Read monitor name.

* test/lisp/filenotify-tests.el (file-notify--test-read-event)
(file-notify--test-timeout): Change timings.
(file-notify--test-monitor): Read remote monitor name more reliably.
(file-notify-test02-rm-watch): Retrieve remote monitor name in time.
(file-notify--test-event-actions): New defun.
(file-notify--test-with-actions-explainer): Use it.
(file-notify--test-with-actions-check): Use it.  Dump traces in
case of debug.
(file-notify--test-with-actions): Don't stop while debugging.
(file-notify-test03-events, file-notify-test04-autorevert)
(file-notify-test05-file-validity)
(file-notify-test07-many-events, file-notify-test08-backup)
(file-notify-test09-watched-file-in-watched-dir): Adapt tests.