Add new parameter assets_path_ignore for dash.Dash() #56

Job	Run time
Build Dash Package	3m 36s
Detect Relevant Path Changes	7s
Typing Tests	2m 37s
Run Background Callback Tests (Python ${{ matrix.python-version }})	0s
Table Server Tests (Group ${{ matrix.test-group }})	0s
Table Unit/Lint Tests (Python ${{ matrix.python-version }})	0s
	6m 20s

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