Update anomaly_detection to sync with genai generate_embedding method

[BichengWang]

Description of the change

Update anomaly_detection to sync genai generate_embedding method:

• update method
• update embedding model

Motivation

The original method deprecated by genai and less runnable

Type of change

Choose one: (Bug fix)

Checklist

• [x ] I have performed a self-review of my code.
• [x ] I have added detailed comments to my code where applicable.
• [x ] I have verified that my change does not break existing code.
• [x ] My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• [x ] I am familiar with the Google Style Guide for the language I have coded in.
• [x ] I have read through the Contributing Guide and signed the Contributor License Agreement.

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