Ensure PlotSize stream works with undefined width/height (#5868) #1454

Job	Run time
Run pre-commit hooks	19s
UI tests on ubuntu-latest with Python 3.9	3m 9s
Pytest on 3.8, Bokeh 2, ubuntu-latest	26m 18s
Pytest on 3.8, Bokeh 3, ubuntu-latest	37m 4s
Pytest on 3.11, Bokeh 2, ubuntu-latest	31m 11s
Pytest on 3.11, Bokeh 3, ubuntu-latest	30m 18s
Pytest on 3.8, Bokeh 2, macos-latest	44m 39s
Pytest on 3.8, Bokeh 3, macos-latest	57m 16s
Pytest on 3.11, Bokeh 2, macos-latest	44m 38s
Pytest on 3.11, Bokeh 3, macos-latest	48m 10s
Pytest on 3.8, Bokeh 2, windows-latest	58m 15s
Pytest on 3.8, Bokeh 3, windows-latest	55m 50s
Pytest on 3.11, Bokeh 2, windows-latest	43m 32s
Pytest on 3.11, Bokeh 3, windows-latest	56m 37s
	8h 57m 16s

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