feat(vercel): Vercel SDK fixes and correct env vars behavior for staging envs #4874

Job	Run time
typecheck / typecheck	6m 20s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	1m 47s
sdk-compat / Bun Runtime	1m 51s
sdk-compat / Node.js 22.12 (ubuntu-latest)	2m 3s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	3m 31s
sdk-compat / Cloudflare Workers	2m 3s
sdk-compat / Node.js 20.20 (ubuntu-latest)	2m 3s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	3m 42s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	1m 52s
sdk-compat / Deno Runtime	2m 1s
units / packages / 🧪 Unit Tests: Packages (1, 1)	9m 7s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 26s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	3m 58s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	8m 3s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	6m 9s
units / internal / 🧪 Unit Tests: Internal (5, 8)	4m 28s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	3m 49s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	2m 38s
units / internal / 🧪 Unit Tests: Internal (7, 8)	5m 21s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	5m 56s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	5m 53s
units / internal / 🧪 Unit Tests: Internal (2, 8)	10m 30s
units / internal / 🧪 Unit Tests: Internal (1, 8)	6m 34s
units / internal / 🧪 Unit Tests: Internal (3, 8)	10m 7s
units / internal / 🧪 Unit Tests: Internal (6, 8)	5m 42s
units / internal / 🧪 Unit Tests: Internal (8, 8)	6m 19s
units / internal / 🧪 Unit Tests: Internal (4, 8)	5m 29s
units / webapp / 📊 Merge Reports	39s
units / packages / 📊 Merge Reports	18s
units / internal / 📊 Merge Reports	27s
	2h 12m 6s

Provide feedback