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19565: tests: move core related applications to their own tests/core/ folder r=maribu a=aabadie 19568: tests: move remaining driver related applications to tests/drivers r=maribu a=aabadie 19574: cpu/stm32/periph_gpio: reset PU/PD for ADC channels r=maribu a=gschorcht ### Contribution description This PR provides a small fix that is relevant when a GPIO has been used as input/output with a pull resistor before it is initialized as an ADC channel. The PU/PD configuration has to be `0b00` for analog outputs which is corresponds to the reset state. However, if the GPIO is not in the reset state but was used digital input/output with any pull resistor, the PU/PD configuration has also to be reset to use it as ADC channel. ### Testing procedure - Green CI - The `periph_adc` test application should still work for any board that supports the `periph_adc` feature. ### Issues/PRs references Co-authored-by: Alexandre Abadie <alexandre.abadie@inria.fr> Co-authored-by: Gunar Schorcht <gunar@schorcht.net>