Consolidate Build & Test CI #28

Job	Run time
Build Element Web	2m 21s
Run Tests [Chrome] 4/4	20s
Run Tests [Chrome] 2/4	20s
Run Tests [Chrome] 1/4	1s
Run Tests [Chrome] 3/4	1s
Prepare Element Desktop / Prepare	2s
Downstream Playwright tests [element-modules]	0s
end-to-end-tests	29s
Desktop Linux	0s
Desktop Windows	0s
Desktop macOS	0s
	3m 34s

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