Add SLINT_TARGET_CARGO_FLAGS cmake variable #10479

Job	Run time
cpp_cmake (ubuntu-20.04)	8m 1s
cpp_cmake (macos-12)	9m 57s
cpp_cmake (windows-2022)	11m 45s
ffi_32bit_build	1m 24s
build_and_test (ubuntu-20.04, stable)	13m 17s
build_and_test (ubuntu-20.04, 1.66)	20m 14s
build_and_test (macos-11, stable)	42m 44s
build_and_test (windows-2022, stable)	34m 32s
build_and_test (windows-2022, 1.66)	34m 46s
cpp_test_driver (ubuntu-20.04)	7m 43s
cpp_test_driver (macos-12)	8m 16s
cpp_test_driver (windows-2022)	8m 39s
fmt_test	1m 37s
mcu	54s
node_test (ubuntu-20.04)	3m 17s
node_test (macos-11)	3m 26s
tree-sitter	13s
uefi-demo	1m 1s
updater_test (0.3.0)	1m 47s
docs / docs	5m 30s
wasm / wasm	3m 30s
wasm_demo / wasm_demo	18m 35s
cpp_package_test	2m 55s
wasm / build-slintpad	46s
wasm / lint-slintpad	39s
	4h 5m 28s

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