Handle last-coding-system-used in Tramp for all backends

Handle last-coding-system-used in Tramp for all backends

* lisp/net/tramp.el (tramp-skeleton-write-region):
Handle `last-coding-system-used'.
(tramp-handle-write-region):
* lisp/net/tramp-adb.el (tramp-adb-handle-write-region):
* lisp/net/tramp-smb.el (tramp-smb-handle-write-region):
* lisp/net/tramp-sshfs.el (tramp-sshfs-handle-write-region):
Set `coding-system-used'.  (Bug#65022)

* lisp/net/tramp-sh.el (tramp-sh-handle-write-region):
Move `last-coding-system-used' handling to
`tramp-skeleton-write-region'.