docs: add `Dropdown` samples #7576

Job	Run time
Tests / A11y Tests	4m 34s
Tests / Static Checks	2m 36s
Tests / Build	1m 1s
Tests / Playwright Tests (chrome)	3m 30s
Tests / Unit Tests	3m 15s
Tests / Playwright Tests (firefox)	3m 3s
Artifacts / Build	4m 55s
Visual Tests / Chromatic	1m 55s
Artifacts / Deploy	33s
	25m 22s

Provide feedback