Remove unused registration tab code
What does this MR do and why?
Remove unused registration tab code
This removes some code related to the registration tab that once lived alongside sign-in tabs. Registration can only be done via standalone pages now.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
No visual changes.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.