chore: align frontend and backend dependencies for stability and compatibility

[Harmanpreet-Microsoft]

Purpose

This pull request primarily updates dependencies across the frontend JavaScript and Python environments, focusing on aligning versions for stability and compatibility. The most important changes are grouped below by theme.

Frontend dependency updates:

• Downgraded react and related packages in package.json from version 19.x to 18.3.1, and reduced versions of react-markdown and react-router-dom to improve compatibility with other dependencies.
• Updated several development dependencies in package.json, including lowering versions for @vitejs/plugin-react and vite, and adjusting type packages for React and Node to match the new React version.

Python backend dependency changes:

• Downgraded azure-storage-blob from version 12.25.1 to 12.20.0 in pyproject.toml, likely for compatibility reasons.
• Downgraded semantic-kernel and pydantic to earlier versions in pyproject.toml to resolve version conflicts or maintain stability.

Data scripts dependency updates:

• Updated azure-identity to a newer version and downgraded azure-keyvault-secrets in scripts/data_scripts/requirements.txt for improved security and compatibility.
• ...

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information