Add new parameter assets_path_ignore for dash.Dash() #51

Job	Run time
Detect Relevant Path Changes	7s
Build Dash Package	1m 18s
Typing Tests	0s
Table Unit/Lint Tests (Python ${{ matrix.python-version }})	0s
Run Background Callback Tests (Python ${{ matrix.python-version }})	0s
Table Server Tests (Group ${{ matrix.test-group }})	0s
	1m 25s

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