chore(ci): optimise runners, distribute test shards #8396

Job	Run time
Detect changes	6s
code-quality / code-quality	1m 18s
typecheck / typecheck	2m 22s
internal / 🧪 Unit Tests: Internal	6m 6s
e2e-webapp / 🧪 E2E Tests: Webapp	2m 50s
e2e / 🧪 CLI v3 tests (warp-ubuntu-latest-x64-4x - npm)	2m 11s
e2e / 🧪 CLI v3 tests (warp-ubuntu-latest-x64-4x - pnpm)	2m 5s
e2e / 🧪 CLI v3 tests (warp-windows-latest-x64-8x - npm)	4m 12s
e2e / 🧪 CLI v3 tests (warp-windows-latest-x64-8x - pnpm)	3m 51s
webapp / 🧪 Unit Tests: Webapp (7, 10)	3m 11s
webapp / 🧪 Unit Tests: Webapp (6, 10)	11m 58s
webapp / 🧪 Unit Tests: Webapp (2, 10)	4m 41s
webapp / 🧪 Unit Tests: Webapp (4, 10)	6m 17s
webapp / 🧪 Unit Tests: Webapp (5, 10)	4m 35s
webapp / 🧪 Unit Tests: Webapp (3, 10)	11m 48s
webapp / 🧪 Unit Tests: Webapp (1, 10)	7m 8s
webapp / 🧪 Unit Tests: Webapp (9, 10)	7m 36s
webapp / 🧪 Unit Tests: Webapp (10, 10)	6m 19s
webapp / 🧪 Unit Tests: Webapp (8, 10)	6m 16s
sdk-compat	0s
packages	0s
webapp / 📊 Merge Reports	28s
All PR Checks	5s
	1h 35m 23s

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