fix: fixes langchain tool calling agent component toolkit

[edwinjosechittilappilly]

This pull request includes several changes to the src/backend directory, focusing on improving the functionality and organization of the langflow components and tests. The most important changes include adding a new method to convert components to toolkits, importing necessary modules, and reorganizing imports in test files.

Improvements to langflow components:

• src/backend/base/langflow/components/langchain_utilities/tool_calling.py: Added imports for _get_component_toolkit and Tool to support the new to_toolkit method.
• src/backend/base/langflow/components/langchain_utilities/tool_calling.py: Added the to_toolkit method to convert components to toolkits, allowing for metadata updates and tool retrieval.

Reorganization of imports in test files:

• src/backend/tests/unit/mock_language_model.py: Reorganized imports by moving pydantic imports to the correct location to improve code readability.
• src/backend/tests/unit/test_schema.py: Added a newline for better separation of imports, enhancing code readability.

[edwinjosechittilappilly]

@ogabrielluiz I added toolkit to the component, since the base class was being used in the agent component. Hence to prevent further issues I added the toolkit in the toolcalling agent component itself. This would override the base class toolkit.

[edwinjosechittilappilly]

@ogabrielluiz I am not sure if this is the best approach. If not urgent lets keep this PR for next release?
If any user faces issues with tool calling agent, we can ask them to use agent component.
looking forward to your suggestion.

[codspeed-hq]

CodSpeed Performance Report

Merging #5878 will not alter performance

_{Comparing fix-langchain-tool-calling-agent-componet-toolkit (0ef557d) with main (5804336)}

Summary

✅ 9 untouched benchmarks

[ogabrielluiz]

Hey @edwinjosechittilappilly

Let's use #6036 instead of adding a build_agent check.

[edwinjosechittilappilly]

@ogabrielluiz, do we need to edit this PR Based on the following PR?

#6036

We might be able to test this scenario once 6036 is merged. It might solve the issue. If not, I shall reopen this PR.

PR #6036 is a good support for this PR.

[ogabrielluiz]

Yes. You should remove the change to get_tools and add tool_mode=False in the build_agent output.

[edwinjosechittilappilly]

Yes. You should remove the change to get_tools and add tool_mode=False in the build_agent output.

Sounds Good!
I shall update those changes in this PR.

We should do this in another PR