fix(vertex_ai): raise error on mid-stream 429/error chunks instead of silently swallowing - #23711

fix(vertex_ai): raise error on mid-stream 429/error chunks instead of silently swallowing#23711

oss-pr-review-agent-shin[bot] merged 4 commits into

BerriAI:shin_agent_oss_staging_05_13_2026BerriAI/litellm:shin_agent_oss_staging_05_13_2026from

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