ICU-22794 MF2: De-duplicate C++ and Java test data #2391

Job	Run time
clang-valgrind-intltest (utility)	7m 18s
clang-valgrind-intltest (normalize)	6m 45s
clang-valgrind-intltest (collator)	5m 0s
clang-valgrind-intltest (regex)	5m 4s
clang-valgrind-intltest (format)	10m 28s
clang-valgrind-intltest (translit)	5m 32s
clang-valgrind-intltest (rbbi)	7m 3s
clang-valgrind-intltest (rbnf)	6m 27s
clang-valgrind-test	10m 2s
clang-valgrind-intltest (rbnfrt)	5m 59s
clang-valgrind-intltest (icuserv)	5m 4s
clang-valgrind-intltest (idna)	4m 55s
clang-valgrind-intltest (convert)	6m 44s
clang-valgrind-intltest (rbnfp)	4m 59s
clang-valgrind-intltest (csdet)	5m 10s
clang-valgrind-intltest (spoof)	5m 5s
clang-valgrind-intltest (bidi)	5m 6s
	1h 46m 41s

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