Fix Tramp part of Bug#28156

Fix Tramp part of Bug#28156

* lisp/files.el (file-name-non-special): Use `file-name-quote'
instead prefixing "/:", the file could already be quoted.

* lisp/net/tramp.el (tramp-error): Handle null arguments.
(tramp-handle-make-symbolic-link):
* lisp/net/tramp-sh.el (tramp-sh-handle-make-symbolic-link)
(tramp-sh-handle-add-name-to-file):
* lisp/net/tramp-smb.el (tramp-smb-handle-add-name-to-file)
(tramp-smb-handle-make-symbolic-link): Adapt implementation to
stronger semantics in Emacs.  (Bug#28156)

* test/lisp/net/tramp-tests.el (tramp-test21-file-links):
Extend test.