selftests/landlock: Simplify ruleset creation and enforcement in fs_test

selftests/landlock: Simplify ruleset creation and enforcement in fs_test

* Add enforce_fs() for defining and enforcing a ruleset in one step
* In some places, dropped "ASSERT_LE(0, fd)" checks after
  create_ruleset() call -- create_ruleset() already checks that.
* In some places, rename "file_fd" to "fd" if it is not needed to
  disambiguate any more.

Signed-off-by: Günther Noack <gnoack3000@gmail.com>
Link: https://lore.kernel.org/r/20260327164838.38231-12-gnoack3000@gmail.com
[mic: Tweak subjet]
Signed-off-by: Mickaël Salaün <mic@digikod.net>