ICU-22953 MF2: Allow unpaired surrogates in text and quoted literals #3057

Job	Run time
clang-valgrind-intltest (utility)	6m 45s
clang-valgrind-test	10m 16s
clang-valgrind-intltest (normalize)	6m 31s
clang-valgrind-intltest (collator)	5m 21s
clang-valgrind-intltest (regex)	6m 6s
clang-valgrind-intltest (format)	16m 19s
clang-valgrind-intltest (translit)	6m 20s
clang-valgrind-intltest (rbbi)	7m 29s
clang-valgrind-intltest (rbnf)	6m 23s
clang-valgrind-intltest (rbnfrt)	6m 26s
clang-valgrind-intltest (icuserv)	5m 36s
clang-valgrind-intltest (idna)	5m 13s
clang-valgrind-intltest (convert)	7m 5s
clang-valgrind-intltest (rbnfp)	5m 15s
clang-valgrind-intltest (csdet)	5m 16s
clang-valgrind-intltest (spoof)	5m 57s
clang-valgrind-intltest (bidi)	5m 33s
	1h 57m 51s

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