Properly solve incompatibility between e-p-m, e-l-m and cc-mode

Properly solve incompatibility between e-p-m, e-l-m and cc-mode

* lisp/progmodes/cc-cmds.el (c--disable-fix-of-bug-33794): Remove.
(c--with-post-self-insert-hook-maybe): Remove.
(c-self-insert-command): New function.
(c-electric-pound, c-electric-brace, c-electric-slash)
(c-electric-star, c-electric-lt-gt, c-electric-paren): Use it.

* test/lisp/electric-tests.el (c--disable-fix-of-bug-33794):
Remove.
(electric-layout-int-main-kernel-style)
(electric-layout-int-main-allman-style): Don't set
c--disable-fix-of-bug-33794.