Remove feature flag renaming_project_with_tags

What does this MR do and why?

The feature flag renaming_project_with_tags has been rolled out in production 100%. As part of the issue, we'd like to now cleanup the feature flag and have the feature enabled.

Where to rename the path:

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 #424801 (closed)