ICU-23341 Update tests for Japanese eras #5164

Job	Run time
clang-valgrind-test	11m 2s
clang-valgrind-intltest (convert)	6m 43s
clang-valgrind-intltest (idna)	5m 7s
clang-valgrind-intltest (collator)	5m 44s
clang-valgrind-intltest (regex)	5m 7s
clang-valgrind-intltest (csdet)	5m 36s
clang-valgrind-intltest (rbbi)	10m 19s
clang-valgrind-intltest (rbnf)	6m 43s
clang-valgrind-intltest (icuserv)	6m 22s
clang-valgrind-intltest (translit)	6m 42s
clang-valgrind-intltest (rbnfrt)	6m 13s
clang-valgrind-intltest (bidi)	6m 20s
clang-valgrind-intltest (format)	32m 31s
clang-valgrind-intltest (normalize)	7m 36s
clang-valgrind-intltest (spoof)	21m 48s
clang-valgrind-intltest (rbnfp)	6m 8s
clang-valgrind-intltest (utility)	7m 8s
	2h 37m 9s

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