Revert "fix(gemini): dereference $defs/$ref in tool response content"

[uc4w6c]

Reverts #19062

I reverted this change because the following command, which runs in CI, failed:

python ./tests/code_coverage_tests/recursive_detector.py

Error detail:

🚨 Unignored recursive functions found in ./litellm/litellm_core_utils/prompt_templates/factory.py: ['_clean_refs_for_gemini']. THIS IS REALLY BAD, it has caused CPU Usage spikes in the past. Only keep this if it's ABSOLUTELY necessary.
Traceback (most recent call last):
  File "/home/circleci/project/litellm/./****s/code_coverage_****s/recursive_detector.py", line 123, in <module>
    raise Exception(
Exception: 🚨 Unignored recursive functions found include ./litellm/litellm_core_utils/prompt_templates/factory.py: ['_clean_refs_for_gemini']. THIS IS REALLY BAD, it has caused CPU Usage spikes in the past. Only keep this if it's ABSOLUTELY necessary.

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Project	Deployment	Review	Updated (UTC)
litellm	Building	Preview, Comment	Jan 16, 2026 1:58am