fix(teradatasql): update Python version, venv workflow, and add run insturctions

[JG255091]

Description

• Removed Vantage and used Teradata instead
• updated python Version
• added better step by step guidance
• removed community links

Please make sure your PR adheres to the following requirements:

• [x ] npm run start still works.
• [x ] npm run build still works.
• [x ] Code adheres to project style guidelines (e.g., linting, formatting).
• [x ] Any new dependencies have been added to the appropriate files.
• [x ] The changes do not introduce new issues or regressions.

Screenshots or Visual Updates (if applicable)

n/a

[github-actions]

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2026-06-17 21:20 UTC