Exclude WIP and draft PRs from tests #210

Job	Run time
lint/style-and-typos	45s
linux/3.8/bare-env	13s
linux/3.8	1m 11s
linux/3.9	20s
linux/3.10	1m 48s
linux/3.11	1m 24s
linux/3.12	1m 12s
osx/3.8	1m 54s
osx/3.9	1m 22s
osx/3.10	1m 53s
osx/3.11	1m 55s
osx/3.12	1m 55s
win/3.8	1s
win/3.9	1s
win/3.10	1s
win/3.11	1s
win/3.12	1s
linux/3.11/conda	1m 19s
linux/3.10/mpi	1m 19s
linux/3.11/singletest	1m 16s
linux/3.10/cython	1m 49s
win/3.8/pip	1s
linux/3.8/slim	1m 9s
linux/3.9/pyutilib	1s
linux/pypy-3.9	1s
process-coverage-${{ matrix.TARGET }}	1s
	22m 53s

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