chore(ci): optimise runners, distribute test shards #8403

Job	Run time
Detect changes	8s
code-quality / code-quality	1m 24s
typecheck / typecheck	2m 15s
internal / 🧪 Unit Tests: Internal	6m 18s
e2e-webapp / 🧪 E2E Tests: Webapp	2m 33s
e2e / 🧪 CLI v3 tests (warp-windows-latest-x64-8x - npm)	4m 3s
e2e / 🧪 CLI v3 tests (warp-ubuntu-latest-x64-4x - npm)	2m 5s
e2e / 🧪 CLI v3 tests (warp-ubuntu-latest-x64-4x - pnpm)	2m 13s
webapp / 🧪 Unit Tests: Webapp (2, 10)	6m 52s
e2e / 🧪 CLI v3 tests (warp-windows-latest-x64-8x - pnpm)	3m 56s
webapp / 🧪 Unit Tests: Webapp (3, 10)	7m 7s
webapp / 🧪 Unit Tests: Webapp (7, 10)	7m 1s
webapp / 🧪 Unit Tests: Webapp (8, 10)	6m 57s
webapp / 🧪 Unit Tests: Webapp (9, 10)	7m 13s
webapp / 🧪 Unit Tests: Webapp (5, 10)	7m 2s
webapp / 🧪 Unit Tests: Webapp (6, 10)	6m 52s
webapp / 🧪 Unit Tests: Webapp (1, 10)	7m 9s
webapp / 🧪 Unit Tests: Webapp (10, 10)	6m 31s
webapp / 🧪 Unit Tests: Webapp (4, 10)	7m 12s
packages	0s
sdk-compat	0s
webapp / 📊 Merge Reports	31s
All PR Checks	5s
	1h 35m 27s

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