ICU-22920 fix exhaustive tests for likely subtags failure ICU-22976 #3101

Job	Run time
clang-valgrind-test	10m 24s
clang-valgrind-intltest (utility)	6m 57s
clang-valgrind-intltest (normalize)	6m 17s
clang-valgrind-intltest (collator)	5m 18s
clang-valgrind-intltest (regex)	5m 23s
clang-valgrind-intltest (format)	16m 10s
clang-valgrind-intltest (translit)	6m 3s
clang-valgrind-intltest (rbbi)	7m 34s
clang-valgrind-intltest (rbnf)	6m 24s
clang-valgrind-intltest (rbnfrt)	6m 24s
clang-valgrind-intltest (icuserv)	5m 24s
clang-valgrind-intltest (idna)	5m 14s
clang-valgrind-intltest (convert)	6m 57s
clang-valgrind-intltest (rbnfp)	5m 25s
clang-valgrind-intltest (csdet)	5m 19s
clang-valgrind-intltest (spoof)	5m 4s
clang-valgrind-intltest (bidi)	5m 42s
	1h 55m 59s

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