Draft: Update performance indicators for gainsight metrics (2/3)

What does this MR do and why?

This MR adds the customer_health_score value to performance_indicator_type for each health score metric's yml file.

Screenshots or screen recordings

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.