fix(webapp): paginate shared Vercel env var fetch in onboarding + pull

[0ski]

Closes #3850

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• apps/webapp/app/models/vercelIntegration.server.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• apps/webapp/app/models/vercelIntegration.server.ts

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Walkthrough

This PR refactors Vercel integration to obtain raw access tokens alongside SDK clients and implements custom HTTP pagination for shared environment variables. A new getVercelClientAndToken helper returns both the Vercel client and access token. The shared env-var listing switches from SDK-based client.environment.listSharedEnvVariable (which has cursor/response limitations) to a raw #fetchAllSharedEnvsRaw helper that paginates through the /v1/env endpoint. Both getVercelSharedEnvironmentVariables and getVercelSharedEnvironmentVariableValues now accept accessToken directly. Callers in pullEnvVarsFromVercel and VercelSettingsPresenter.getOnboardingData are updated to use the new signatures.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is incomplete; it only includes issue reference and a screenshot without addressing template sections like Checklist, Testing, or Changelog.	Complete the PR description by adding Testing section with test steps, Changelog with change summary, and confirming all checklist items are addressed.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: implementing pagination for shared Vercel environment variable fetching in onboarding and pull operations.
Linked Issues check	✅ Passed	Code changes directly address #3850 by implementing pagination via new getVercelClientAndToken helper and #fetchAllSharedEnvsRaw to follow pagination.next across multiple pages for shared env-vars.
Out of Scope Changes check	✅ Passed	All changes are in-scope: modifications to VercelIntegrationRepository and VercelSettingsPresenter focus solely on pagination implementation and passing accessToken for shared env-var retrieval.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✅ Devin Review: No Issues Found

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