ci(e2e): cache Playwright browser downloads #383

Job	Run time
run / integration	3m 22s
run / Go Test (race detector)	8m 14s
run / lint	7m 26s
run / Desktop Unit Tests (Windows)	4m 3s
run / e2e	6m 43s
run / Go Test (windows-latest)	29m 45s
run / Go Test (ubuntu-latest)	7m 53s
run / docs	34s
run / frontend	2m 58s
run / frontend-node-25	2m 39s
run / scripts	6s
	1h 13m 43s

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