ICU-22834 MF2: make tests compliant with schema and update spec tests #2410

Job	Run time
clang-valgrind-test	9m 55s
clang-valgrind-intltest (utility)	6m 59s
clang-valgrind-intltest (normalize)	6m 22s
clang-valgrind-intltest (collator)	5m 1s
clang-valgrind-intltest (regex)	5m 3s
clang-valgrind-intltest (format)	17m 4s
clang-valgrind-intltest (translit)	5m 48s
clang-valgrind-intltest (rbbi)	8m 14s
clang-valgrind-intltest (rbnf)	7m 8s
clang-valgrind-intltest (rbnfrt)	5m 56s
clang-valgrind-intltest (icuserv)	4m 44s
clang-valgrind-intltest (idna)	5m 38s
clang-valgrind-intltest (convert)	6m 36s
clang-valgrind-intltest (rbnfp)	5m 0s
clang-valgrind-intltest (csdet)	5m 11s
clang-valgrind-intltest (spoof)	5m 5s
clang-valgrind-intltest (bidi)	5m 2s
	1h 54m 46s

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