ICU-22794 MF2: De-duplicate C++ and Java test data #2336

Job	Run time
clang-valgrind-test	10m 6s
clang-valgrind-intltest (utility)	6m 37s
clang-valgrind-intltest (normalize)	5m 53s
clang-valgrind-intltest (collator)	5m 9s
clang-valgrind-intltest (regex)	5m 15s
clang-valgrind-intltest (format)	16m 44s
clang-valgrind-intltest (translit)	6m 16s
clang-valgrind-intltest (rbbi)	7m 13s
clang-valgrind-intltest (rbnf)	6m 18s
clang-valgrind-intltest (rbnfrt)	6m 8s
clang-valgrind-intltest (icuserv)	5m 13s
clang-valgrind-intltest (idna)	5m 27s
clang-valgrind-intltest (convert)	6m 39s
clang-valgrind-intltest (rbnfp)	5m 1s
clang-valgrind-intltest (csdet)	5m 18s
clang-valgrind-intltest (spoof)	4m 54s
clang-valgrind-intltest (bidi)	6m 3s
	1h 54m 14s

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