Add assertion-based matplotlib tests for mpl_draw #6264

Job	Run time
Build, rustfmt, and python lint	1m 36s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} ${{ matrix.msrv }}	0s
python-stubs-${{ matrix.python-version }}	0s
Build Docs	0s
Coverage	0s
	1m 36s

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