chore(ci): optimise runners, distribute test shards (#4240) #3427

Job	Run time
units / packages / 🧪 Unit Tests: Packages (2, 3)	3m 2s
typecheck / typecheck	2m 58s
units / webapp / 🧪 Unit Tests: Webapp (10, 12)	6m 30s
units / webapp / 🧪 Unit Tests: Webapp (7, 12)	6m 27s
units / internal / 🧪 Unit Tests: Internal	6m 7s
units / packages / 🧪 Unit Tests: Packages (3, 3)	4m 18s
units / e2e-webapp / 🧪 E2E Tests: Webapp	2m 31s
units / packages / 🧪 Unit Tests: Packages (1, 3)	3m 10s
units / webapp / 🧪 Unit Tests: Webapp (3, 12)	6m 16s
units / webapp / 🧪 Unit Tests: Webapp (5, 12)	6m 11s
units / webapp / 🧪 Unit Tests: Webapp (8, 12)	6m 27s
units / webapp / 🧪 Unit Tests: Webapp (4, 12)	6m 8s
units / webapp / 🧪 Unit Tests: Webapp (1, 12)	6m 34s
units / webapp / 🧪 Unit Tests: Webapp (9, 12)	6m 35s
units / webapp / 🧪 Unit Tests: Webapp (11, 12)	6m 50s
units / webapp / 🧪 Unit Tests: Webapp (12, 12)	6m 46s
units / webapp / 🧪 Unit Tests: Webapp (2, 12)	6m 23s
units / webapp / 🧪 Unit Tests: Webapp (6, 12)	6m 13s
publish-webapp / publish	6m 25s
publish-worker-v4 / build (supervisor)	3m 7s
units / packages / 📊 Merge Reports	19s
units / webapp / 📊 Merge Reports	33s
📣 Dispatch main image	7s
scan-webapp / Scan	1m 10s
	1h 51m 7s

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