Add a new descendants api as well as deeper element queries to ElementHandle #15980

Job	Run time
node_test (ubuntu-22.04)	4m 1s
build_and_test (ubuntu-22.04, 1.73)	12m 34s
node_test (macos-12)	16m 57s
build_and_test (macos-12, stable)	20m 14s
node_test (windows-2022)	14m 11s
build_and_test (windows-2022, stable)	21m 30s
build_and_test (windows-2022, 1.73)	19m 46s
build_and_test (windows-2022, beta, --exclude ffmpeg --exclude gstreamer-player)	19m 28s
cpp_test_driver (ubuntu-22.04)	6m 19s
mcu (pico-st7789, thumbv6m-none-eabi)	35s
build_and_test (ubuntu-22.04, nightly)	10m 13s
cpp_cmake (macos-12, 1.73)	19m 1s
cpp_test_driver (macos-12)	5m 33s
mcu (stm32h735g, thumbv7em-none-eabihf)	34s
cpp_cmake (windows-2022, nightly)	7m 50s
cpp_test_driver (windows-2022)	7m 23s
cpp_cmake (ubuntu-22.04, stable)	6m 36s
mcu_esp	2m 34s
python_test (ubuntu-22.04)	1m 32s
python_test (macos-12)	1m 36s
mcu_zephyr (native_sim/native/64, x86_64-unknown-linux-gnu)	5m 29s
android	1m 50s
python_test (windows-2022)	3m 23s
mcu_zephyr (mimxrt1170_evk@B/mimxrt1176/cm7, thumbv7em-none-eabi, -DSHIELD=rk055hdmipi4ma0)	6m 8s
esp-idf-quick	8m 36s
ffi_32bit_build	1m 4s
fmt_test	1m 47s
miri	51s
uefi-demo	33s
updater_test (0.3.0)	1m 40s
docs / docs	7m 3s
tree-sitter / tree-sitter-tests	10s
wasm_demo / wasm_demo	14m 34s
wasm / wasm	3m 40s
wasm / lint-slintpad	21s
wasm / build-slintpad	41s
cpp_package_test	2m 31s
	4h 18m 48s

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