Enable Code Quality Inline Findings feature flag by default

What does this MR do and why?

This MR enables the Code Quality Inline Findings feature flag by default since it was successfully rolled out on .com 4 weeks ago.

Rollout Issue: #364198 (closed)

Screenshots or screen recordings

https://about.gitlab.com/releases/2022/12/22/gitlab-15-7-released/#see-multiple-findings-in-code-quality-changes-view

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.