tests/micropython: Extend MPY import tests for RV32.

This commit extends the "micropython/import_mpy_native_gc" test with a
pre-built serialised MPY file built for RV32.

Before this commit, the test was skipped on said platform due to the
lack of a known-good MPY file to test the import procedure against.
Now the test is executed as part of the general CI test checks.

The MPY file's Makefile script was also updated to cater for modern
Linux environments where the required Python interpreter's command name
isn't "python", but "python3" instead (this occurs when using the past
two LTS Ubuntu releases for example).  This is the same kind of change
made in 31a008c6e26eccc3798a9ab4169019a02eadb830.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

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