ICU-22827 Fix memLeak by using LocalUResourceBundlePointer #2470

Job	Run time
clang-valgrind-test	11m 30s
clang-valgrind-intltest (utility)	6m 35s
clang-valgrind-intltest (normalize)	5m 48s
clang-valgrind-intltest (collator)	5m 47s
clang-valgrind-intltest (regex)	6m 16s
clang-valgrind-intltest (format)	16m 28s
clang-valgrind-intltest (translit)	5m 46s
clang-valgrind-intltest (rbbi)	7m 27s
clang-valgrind-intltest (rbnf)	6m 6s
clang-valgrind-intltest (rbnfrt)	6m 2s
clang-valgrind-intltest (icuserv)	5m 9s
clang-valgrind-intltest (idna)	5m 53s
clang-valgrind-intltest (convert)	6m 31s
clang-valgrind-intltest (rbnfp)	5m 1s
clang-valgrind-intltest (csdet)	4m 50s
clang-valgrind-intltest (spoof)	5m 40s
clang-valgrind-intltest (bidi)	5m 51s
	1h 56m 40s

Provide feedback