ICU-23358 Make RBNF lenient parsing of ignorables more consistent bet… #5166

Job	Run time
clang-valgrind-test	11m 26s
clang-valgrind-intltest (format)	17m 3s
clang-valgrind-intltest (normalize)	6m 47s
clang-valgrind-intltest (collator)	5m 23s
clang-valgrind-intltest (regex)	5m 14s
clang-valgrind-intltest (bidi)	5m 52s
clang-valgrind-intltest (spoof)	6m 5s
clang-valgrind-intltest (translit)	6m 16s
clang-valgrind-intltest (idna)	6m 0s
clang-valgrind-intltest (csdet)	6m 23s
clang-valgrind-intltest (utility)	7m 7s
clang-valgrind-intltest (rbnfp)	21m 49s
clang-valgrind-intltest (rbnfrt)	6m 47s
clang-valgrind-intltest (icuserv)	6m 5s
clang-valgrind-intltest (rbnf)	6m 19s
clang-valgrind-intltest (convert)	9m 49s
clang-valgrind-intltest (rbbi)	10m 11s
	2h 24m 36s

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