Remove `tools` from LLMs

[techcontributor]

Description

Removed the use of tools from all LLMs, also removed unnecessary LLM test cases.

Fixes #2283

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Refactor (does not change functionality, e.g. code style improvements, linting)
• [ ] Documentation update

How Has This Been Tested?

Tested locally with the test cases.

• [x] Unit Test
• [ ] Test Script (please provide)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have checked my code and corrected any misspellings

Maintainer Checklist

• [ ] closes #xxxx (Replace xxxx with the GitHub issue number)
• [ ] Made sure Checks passed

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Name	Status	Preview	Comments	Updated (UTC)
multimodal-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 12, 2025 7:57pm

[Dev-Khant]

@techcontributor Thanks for the contribution!