[wrangler] fix: update remote proxy session error test snapshots

[petebacondarwin]

Fixes the test regression introduced by #11896, which enriched the error thrown by startRemoteProxySession but pointed two real-API tests at a regex (Failed to create a preview token) that does not match the message that actually surfaces in CI:

Failed to start the remote proxy session. Error reloading remote server: A request to the Cloudflare API (/accounts/<id>/workers/subdomain/edge-preview) failed.

This PR updates the two tests that exercise real API calls so their assertions reflect the actual error string:

• fixtures/get-platform-proxy-remote-bindings/tests/index.test.ts — back to toMatchInlineSnapshot (the invalid account id is a hard-coded literal here, so no normalization needed).
• packages/wrangler/e2e/remote-binding/remote-bindings-api.test.ts — capture via try/catch and assert against normalizeOutput(...) so the real CLOUDFLARE_ACCOUNT_ID is normalized in the snapshot.

The mocked unit test in packages/wrangler/src/__tests__/dev/remote-bindings-errors.test.ts and the loosely-asserting packages/vite-plugin-cloudflare/e2e/remote-bindings.test.ts are unaffected and were left alone.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: test-only change; no user-facing behaviour change.

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[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

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[ask-bonk]

Review posted successfully on PR #13935. The main feedback is about the try/catch pattern in the e2e tests — if the function under test stops throwing, error remains undefined and the test fails with a confusing snapshot mismatch rather than a clear "expected to throw" message. I suggested an alternative using .catch((e) => e) combined with expect(error).toBeInstanceOf(Error) to make the intent explicit while still allowing normalizeOutput on the error message.

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[workers-devprod]

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commit: 426e2e2