This marker enables the skipping of tests that, for any reason, cannot
be executed with the IDF build system version 2. It accepts an optional
string argument that explains why the test cannot be run with version 2.
If no explanation is provided, a default message is used. This marker is
used in the `pytest_collection_modifyitems` hook to skip tests marked
with it when the `--buildv2` pytest command line option is used.
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>