fix images being dropped from tool results for bedrock

[cyberjunk]

1. Fixes [Bug]: LiteLLM Proxy drops image from tool result for Anthropic on AWS Bedrock #16195
2. Also keeps text in dedicated blocks rather than concatenating them

[CLAassistant]

All committers have signed the CLA.

[vercel]

@cyberjunk is attempting to deploy a commit to the CLERKIEAI Team on Vercel.

A member of the Team first needs to authorize it.

[krrishdholakia]

@cyberjunk can you fix linting errors + add testing to test_litellm/

[cyberjunk]

@krrishdholakia

1. I fixed the mentioned type error in the linting
2. I did not find any test for the modified _convert_to_bedrock_tool_call_result(). Can you please point out where I should add the test? Should it be a unit test for this function or a full test that actually calls a LLM on Bedrock with an image tool result?

[krrishdholakia]

Hi @cyberjunk just a unit test is fine here - https://github.com/BerriAI/litellm/blob/main/tests/test_litellm/litellm_core_utils/prompt_templates/test_litellm_core_utils_prompt_templates_factory.py