ICU-22885 Add test to show the problem of DecimalFormat #2746

Job	Run time
clang-valgrind-intltest (utility)	6m 43s
clang-valgrind-test	10m 39s
clang-valgrind-intltest (normalize)	6m 33s
clang-valgrind-intltest (collator)	5m 44s
clang-valgrind-intltest (regex)	5m 57s
clang-valgrind-intltest (format)	7m 43s
clang-valgrind-intltest (translit)	6m 0s
clang-valgrind-intltest (rbbi)	8m 5s
clang-valgrind-intltest (rbnf)	6m 46s
clang-valgrind-intltest (rbnfrt)	6m 20s
clang-valgrind-intltest (icuserv)	3m 14s
clang-valgrind-intltest (idna)	5m 9s
clang-valgrind-intltest (convert)	7m 21s
clang-valgrind-intltest (rbnfp)	5m 59s
clang-valgrind-intltest (csdet)	5m 47s
clang-valgrind-intltest (spoof)	5m 38s
clang-valgrind-intltest (bidi)	5m 30s
	1h 49m 8s

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