MR Widget Component V2

What does this MR do and why?

This MR creates a Widget component is going to be used to create MR widgets. It currently fetches the collapsed data. Additional logic will be provided in subsequent MRs.

Screenshots or screen recordings

How to set up and validate locally

1. This feature is behind a feature flag. Enable :refactor_security_extension to turn this feature on.

echo "Feature.enable(:refactor_security_extension)" | rails c

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.

Related to #368254 (closed)