Add RTC timezone mode option #4259

Job	Run time
detect-code-related-file-changes	8s
coding-style	29s
host-arm64	14m 43s
static-analysis	1m 59s
macOS-arm64 (gcc-15)	41m 12s
host-x64 (gcc)	13m 10s
host-x64 (clang)	14m 42s
macOS-arm64 (clang)	29m 46s
boot-tests-x64 (clang, t2c, system_jit_defconfig, ENABLE_MOP_FUSION=0, 120)	21m 0s
boot-tests-x64 (clang, jit, system_defconfig, ENABLE_JIT=1 ENABLE_MOP_FUSION=0, 90)	18m 44s
boot-tests-x64 (clang, interpreter, system_defconfig, 60)	3m 38s
boot-tests-x64 (gcc, jit, system_defconfig, ENABLE_JIT=1 ENABLE_MOP_FUSION=0, 90)	18m 18s
docker-hub-build-and-publish	1m 4s
boot-tests-x64 (gcc, interpreter, system_defconfig, 60)	3m 24s
	3h 2m 17s

Provide feedback