fix: stop CLI free-trial polling for non-free-trial models

[guoyi-smh]

Summary

• gate the CLI free-trial status fetch/polling behind an actual free-trial model check
• keep the existing 5 second polling behavior only for free-trial continue-proxy models
• add a focused UI test covering both the non-free-trial and free-trial paths

Closes #11214.

Validation

• ./node_modules/.bin/vitest run src/ui/FreeTrialStatus.test.tsx
• ./node_modules/.bin/eslint src/ui/FreeTrialStatus.tsx src/ui/FreeTrialStatus.test.tsx

Notes

• I installed dependencies locally in extensions/cli to run the focused test.
• A full npm install currently trips the package prepare build in this checkout because sibling workspace packages are not built, so validation stayed scoped to the touched files.

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Summary by cubic

Stops the CLI from fetching or polling free‑trial status for non‑free‑trial models. Keeps immediate fetch and 5s polling only for free‑trial continue-proxy models, and skips installing Remote-* marketplace extensions in VS Code E2E when IGNORE_SSH_TESTS=true. Closes #11214.

• Bug Fixes
  • Gate initial fetch/polling to free‑trial models via isModelUsingFreeTrial(model); add mounted checks and skip polling in test env.
  • Add focused UI tests for non‑free‑trial and free‑trial paths, including polling cadence.
  • Add extensions/vscode/e2e/install-marketplace-extensions.mjs and update e2e:install-extensions to honor IGNORE_SSH_TESTS=true.

^{Written for commit e5c8a67. Summary will update on new commits.}

[github-actions]

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[cubic-dev-ai]

No issues found across 2 files

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[guoyi-smh]

I have read the CLA Document and I hereby sign the CLA