[Bug Fix] Exception mapping for context window exceeded - should catch vertex AI claude exceptions

[gcardoso2314]

Title

Correctly map context exceeded errors for Claude models in Vertex AI

Relevant issues

We've been getting the following error returned from LiteLLM Proxy when using Claude models in Vertex AI:

{"type":"error","error":{"type":"invalid_request_error","message":"input length and `max_tokens` exceed context limit: 195261 + 12288 > 204650, decrease input length or `max_tokens` and try again"},"request_id":"<REDACTED>"}

Pre-Submission checklist

New test passing:

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• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
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Type

🐛 Bug Fix
✅ Test

Changes

Added a new string that should map to context window exceeded error to allow the context fallbacks to kick in.

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