Hide new nav callout for new users

What does this MR do and why?

Hide new nav callout for new users

Users that registered after the new navigation feature flag was fully rolled out do not need to see the announcement about it. This adds a date check to ensure only users created before June 2nd 2023 get the callout.

Changelog: changed

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.

Related to #411632 (closed)