dcc: refactor dropdown #356

Job	Run time
Detect Relevant Path Changes	7s
Build Dash Package	3m 9s
Typing Tests	2m 46s
Run Background & Async Callback Tests (Python 3.12)	10m 20s
Run Background & Async Callback Tests (Python 3.9)	30m 17s
Table Server Tests (Group 2)	14m 13s
Table Server Tests (Group 3)	13m 53s
Table Server Tests (Group 1)	14m 24s
Table Unit/Lint Tests (Python 3.12)	1m 40s
	1h 30m 49s

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