perlapi: Combine all isUTF8_CHAR variants into one entry #13517

Job	Run time
Sanity: Linux -Dusethreads	10m 33s
involved_authors_debug	0s
macOS (Monterey) 12 (-Uusethreads)	11m 10s
install	10m 24s
macOS (Monterey) 12 (-Duseithreads -Duseshrplib)	13m 1s
cygwin	33m 52s
linux (-Uusethreads)	9m 26s
linux i386/ubuntu (-Dusedevel)	15m 49s
linux (-Duseshrplib -Dusequadmath -Dusecbacktrace -Dusethreads)	11m 12s
Windows mingw64	33m 43s
minitest	3m 39s
linux (-Duserelocatableinc)	9m 26s
Windows msvc142	51m 13s
linux (-Dcc='clang')	9m 48s
linux (-Dcc='g++')	9m 46s
ASAN (-Accflags=-DPURIFY)	21m 37s
linux (-Accflags=-DSILENT_NO_TAINT_SUPPORT)	9m 23s
ASAN (-DDEBUGGING)	22m 53s
dist-modules (latest)	2m 14s
linux (-Accflags=-DNO_TAINT_SUPPORT)	9m 33s
ASAN (-Dusethreads)	22m 50s
linux (-DDEBUGGING -Accflags=-DPERL_RC_STACK)	9m 35s
dist-modules (5.24)	2m 15s
linux (-Uusedl)	9m 23s
dist-modules (5.10)	2m 14s
dist-modules (5.8)	2m 32s
Test dist/ modules on MacOS system perl	4m 22s
PERL_UNICODE (-Uusethreads)	8m 24s
PERL_UNICODE (-Dusethreads -Accflags=-DPURIFY -Dcc='gcc -fsanitize=address' -Dld='gcc -fsanitize=...	23m 17s
	6h 23m 34s

Provide feedback