ICU-22991 Reduce Calendar object size #3318

Job	Run time
clang-valgrind-test	10m 46s
clang-valgrind-intltest (utility)	6m 53s
clang-valgrind-intltest (normalize)	6m 27s
clang-valgrind-intltest (collator)	5m 37s
clang-valgrind-intltest (regex)	5m 33s
clang-valgrind-intltest (format)	16m 48s
clang-valgrind-intltest (translit)	6m 13s
clang-valgrind-intltest (rbbi)	7m 48s
clang-valgrind-intltest (rbnf)	6m 15s
clang-valgrind-intltest (rbnfrt)	6m 34s
clang-valgrind-intltest (icuserv)	5m 25s
clang-valgrind-intltest (idna)	5m 37s
clang-valgrind-intltest (convert)	6m 49s
clang-valgrind-intltest (rbnfp)	5m 27s
clang-valgrind-intltest (csdet)	5m 24s
clang-valgrind-intltest (spoof)	5m 45s
clang-valgrind-intltest (bidi)	5m 43s
	1h 59m 4s

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