ICU-22560 Merge ICU 74 maintenance branch to main #1153

Job	Run time
clang-valgrind-test	15m 20s
clang-valgrind-intltest (utility)	9m 51s
clang-valgrind-intltest (normalize)	7m 31s
clang-valgrind-intltest (collator)	7m 23s
clang-valgrind-intltest (regex)	7m 38s
clang-valgrind-intltest (format)	27m 32s
clang-valgrind-intltest (translit)	8m 2s
clang-valgrind-intltest (rbbi)	11m 48s
clang-valgrind-intltest (rbnf)	7m 42s
clang-valgrind-intltest (rbnfrt)	8m 12s
clang-valgrind-intltest (icuserv)	8m 32s
clang-valgrind-intltest (idna)	7m 0s
clang-valgrind-intltest (convert)	8m 31s
clang-valgrind-intltest (rbnfp)	7m 36s
clang-valgrind-intltest (csdet)	9m 31s
clang-valgrind-intltest (spoof)	6m 2s
clang-valgrind-intltest (bidi)	6m 42s
	2h 44m 53s

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