chore(ci): optimise runners, distribute test shards #8393

Job	Run time
code-quality / code-quality	1m 48s
Detect changes	7s
e2e / 🧪 CLI v3 tests (warp-windows-latest-x64-8x - pnpm)	3m 24s
internal / 🧪 Unit Tests: Internal	2m 49s
e2e-webapp / 🧪 E2E Tests: Webapp	3m 24s
typecheck / typecheck	2m 53s
e2e / 🧪 CLI v3 tests (warp-ubuntu-latest-x64-4x - pnpm)	2m 0s
e2e / 🧪 CLI v3 tests (warp-windows-latest-x64-8x - npm)	3m 6s
webapp / 🧪 Unit Tests: Webapp (1, 3)	3m 1s
webapp / 🧪 Unit Tests: Webapp (2, 3)	2m 58s
e2e / 🧪 CLI v3 tests (warp-ubuntu-latest-x64-4x - npm)	1m 55s
webapp / 🧪 Unit Tests: Webapp (3, 3)	2m 57s
packages	0s
sdk-compat	0s
All PR Checks	5s
webapp / 📊 Merge Reports	1s
	30m 28s

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