test(ollama): Add unit test for ChatOllama reasoning parameter

[Deshbhushan]

This PR adds missing unit tests for the reasoning parameter in ChatOllama.

The reasoning parameter (used for thinking models like DeepSeek R1) was implemented but lacked explicit unit tests. This test ensures the parameter is correctly passed to the Ollama API as the think parameter.

Test Coverage:

• reasoning=True in constructor
• reasoning=False in constructor
• reasoning passed in invoke() method

Fixes missing test coverage for the reasoning feature.(Replace this entire block of text)

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[codspeed-hq]

CodSpeed Performance Report

Merging #34095 will not alter performance

_{Comparing Deshbhushan:main (6b4b10d) with master (c375732)¹}

Summary

✅ 1 untouched
⏩ 33 skipped²

Footnotes

1. No successful run was found on master (7fe1c4b) during the generation of this report, so c375732 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

2. 33 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[mdrxy]

Can you update to pass CI?

[Deshbhushan]

Can you update to pass CI?

Done :)