Grove Button Shields DTS Binding

This integration test verifies the DTS binding of the Grove Button Shields against all possible boards and shields that are supported by Zephyr and Bridle.

Depending on the number of compatible boards, this test suite will take several hours to complete:

west twister \
     --jobs 4 \
     --verbose \
     --inline-logs \
     --testsuite-root bridle/tests/shields/grove_btn/dts_bindings

With the option --cmake-only the test time can be reduced significantly, but then the runtime filter will not act as expected and the filtering rules become ineffective:

west twister \
     --jobs 4 \
     --verbose \
     --cmake-only \
     --inline-logs \
     --testsuite-root bridle/tests/shields/grove_btn/dts_bindings

Even more time can be saved by limiting the test runs to the boards currently supported by this shield and that will be used for maintenance:

west twister \
     --jobs 4 \
     --verbose \
     --inline-logs \
     --platform rpi_pico \
     --platform nucleo_f303re \
     --platform nucleo_f401re \
     --platform nucleo_f413zh \
     --platform nucleo_f767zi \
     --platform mimxrt1010_evk \
     --platform mimxrt1060_evk \
     --platform mimxrt1060_evkb \
     --board-root bridle/boards \
     --platform seeed_xiao_samd21 \
     --platform seeeduino_xiao \
     --platform seeeduino_lotus \
     --platform arduino_zero \
     --testsuite-root bridle/tests/shields/grove_btn/dts_bindings