chore: add scaffold-ui tests #6287

Job	Run time
code_style (lint)	2m 43s
test	2m 3s
Bundle size check	2m 36s
code_style (prettier)	1m 51s
code_style (typecheck)	2m 5s
code_style (build:sample-apps)	3m 34s
code_style (danger)	1m 46s
ui-test / Playwright Tests (1, 5)	12m 2s
ui-test / Playwright Tests (2, 5)	12m 30s
ui-test / Playwright Tests (3, 5)	11m 32s
ui-test / Playwright Tests (4, 5)	11m 26s
ui-test / Playwright Tests (5, 5)	12m 43s
ui-test / setup_playwright_runners / setup-runners	1m 40s
	1h 18m 31s

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