esh-opt.el: Add a :parse-leading-options-only argument (Bug#28323)

esh-opt.el: Add a :parse-leading-options-only argument (Bug#28323)

* lisp/eshell/esh-opt.el (eshell-eval-using-options): Add a new
:parse-leading-options-only argument which ignores dash/switch
arguments after the first positional argument.
(eshell--process-args): Abort processing of arguments if we see one
positional argument and :parse-leading-options-only is set.
* lisp/eshell/em-tramp.el (eshell/sudo): Use
:parse-leading-options-only, to avoid parsing subcommand switches as
switches of sudo itself.
* test/lisp/eshell/esh-opt-tests.el: Add tests for new and old behavior.