Fix faceup tests when run from elc

Fix faceup tests when run from elc

String literals may be shared by the compiler, so the test string
needs to be copied before adding properties to it.  For single
properties, just use a string literal with properties.
* test/lisp/emacs-lisp/faceup-tests/faceup-test-basics.el
(faceup-markup): Split into...
(faceup-markup-basics, faceup-markup-escaping, faceup-markup-plain)
(faceup-markup-plain-full-text, faceup-markup-anonymous-face)
(faceup-markup-anonymous-face-2keys, faceup-markup-anonymous-nested)
(faceup-markup-nested, faceup-markup-overlapping)
(faceup-markup-multi-face, faceup-markup-multi-property): New tests.