ICU-22991 Reduce Calendar object size #3310

Job	Run time
clang-valgrind-intltest (utility)	6m 58s
clang-valgrind-test	10m 26s
clang-valgrind-intltest (normalize)	6m 25s
clang-valgrind-intltest (collator)	5m 26s
clang-valgrind-intltest (regex)	5m 21s
clang-valgrind-intltest (format)	16m 32s
clang-valgrind-intltest (translit)	6m 10s
clang-valgrind-intltest (rbbi)	8m 5s
clang-valgrind-intltest (rbnf)	6m 31s
clang-valgrind-intltest (rbnfrt)	6m 22s
clang-valgrind-intltest (icuserv)	5m 36s
clang-valgrind-intltest (idna)	5m 31s
clang-valgrind-intltest (convert)	6m 45s
clang-valgrind-intltest (rbnfp)	5m 24s
clang-valgrind-intltest (csdet)	5m 23s
clang-valgrind-intltest (spoof)	5m 31s
clang-valgrind-intltest (bidi)	5m 29s
	1h 57m 55s

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