ICU-22991 Reduce Calendar object size #3323

Job	Run time
clang-valgrind-intltest (utility)	6m 49s
clang-valgrind-intltest (normalize)	6m 9s
clang-valgrind-test	10m 19s
clang-valgrind-intltest (collator)	5m 12s
clang-valgrind-intltest (regex)	5m 53s
clang-valgrind-intltest (format)	16m 19s
clang-valgrind-intltest (translit)	6m 25s
clang-valgrind-intltest (rbbi)	8m 15s
clang-valgrind-intltest (rbnf)	6m 46s
clang-valgrind-intltest (rbnfrt)	6m 26s
clang-valgrind-intltest (icuserv)	5m 51s
clang-valgrind-intltest (idna)	5m 57s
clang-valgrind-intltest (convert)	7m 18s
clang-valgrind-intltest (rbnfp)	5m 15s
clang-valgrind-intltest (csdet)	5m 18s
clang-valgrind-intltest (spoof)	5m 35s
clang-valgrind-intltest (bidi)	5m 24s
	1h 59m 11s

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