ICU-22534 BRS#19 Update ICU4C API Change Report (frontloading) #4

Job	Run time
clang-valgrind-test	9m 11s
clang-valgrind-intltest (utility)	6m 22s
clang-valgrind-intltest (normalize)	5m 41s
clang-valgrind-intltest (collator)	4m 36s
clang-valgrind-intltest (regex)	4m 49s
clang-valgrind-intltest (format)	16m 26s
clang-valgrind-intltest (translit)	5m 30s
clang-valgrind-intltest (rbbi)	7m 14s
clang-valgrind-intltest (rbnf)	5m 39s
clang-valgrind-intltest (rbnfrt)	6m 9s
clang-valgrind-intltest (icuserv)	4m 51s
clang-valgrind-intltest (idna)	4m 57s
clang-valgrind-intltest (convert)	6m 32s
clang-valgrind-intltest (rbnfp)	4m 51s
clang-valgrind-intltest (csdet)	4m 58s
clang-valgrind-intltest (spoof)	4m 41s
clang-valgrind-intltest (bidi)	5m 10s
	1h 47m 37s

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