CC Mode: Fix interplay between string fences and electric-pair-mode.

CC Mode: Fix interplay between string fences and electric-pair-mode.

This is an amendment to the fix for bug #55230.

* lisp/progmodes/cc-defs.el: (c-with-string-fences): Add an edebug spec.

* lisp/progmodes/cc-cmds.el: (c-electric-pound, c-electric-brace)
(c-electric-slash, c-electric-star, c-electric-semi&comma, c-electric-colon)
(c-electric-lt-gt, c-electric-paren): Put the final
c--call-post-self-insert-hook-more-safely outside of the functions'
c-with-string-fences.
(c-electric-brace, c-electric-lt-gt, c-electric-paren): Put the calls to
electric-pair-post-self-insert-function outside of c-with-string-fences.