Update `runtime` and `dt` in `pset.execute` to accept timedelta #1363

Job	Run time
py3.11 \| ubuntu \| unit tests	3m 57s
py3.12 \| ubuntu \| unit tests	4m 8s
py${{ matrix.python-version }} \| ${{ matrix.os }} \| integration tests	0s
mypy	0s
merge-test-artifacts	-1s
	8m 4s

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