Use session IDs for prompt cache keys - #33035
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## What changed - Default `prompt_cache_key` to the session ID from response metadata instead of the thread ID. - Preserve explicit prompt cache key overrides. - Verify that API-key-authenticated root and subagent requests use the same session-based cache key even though they have different thread IDs. GitOrigin-RevId: cb1bf21a3cb8fa2c5083c5c6afd4829ff2adcf1f
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Use session IDs for prompt cache keys
What changed
prompt_cache_keyto the session ID from response metadata instead of the thread ID.