Tramp code cleanup

Tramp code cleanup

* lisp/net/tramp-compat.el (tramp-compat-seq-keep): New defalias.

* lisp/net/tramp.el (tramp-enable-method):
* lisp/net/tramp-adb.el (tramp-adb-parse-device-names):
* lisp/net/tramp-cache.el (tramp-list-connections):
* lisp/net/tramp-cmds.el (tramp-bug, tramp-append-tramp-buffers):
* lisp/net/tramp-container.el (tramp-container--completion-function)
(tramp-toolbox--completion-function)
(tramp-flatpak--completion-function)
(tramp-apptainer--completion-function):
* lisp/net/tramp-rclone.el (tramp-rclone-parse-device-names): Use it.