Add new parameter assets_path_ignore for dash.Dash() #50

Job	Run time
Build Dash Package	1m 15s
Detect Relevant Path Changes	7s
Table Unit/Lint Tests (Python ${{ matrix.python-version }})	-1s
Table Server Tests (Group ${{ matrix.test-group }})	-1s
Run Background Callback Tests (Python ${{ matrix.python-version }})	-1s
Typing Tests	-1s
	1m 18s

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