hide new  issue or MR button for not signed users for a group

## What does this MR do?
This MR prevents user creating issues or MR without signing in

## Are there points in the code the reviewer needs to double check?
NR
## Why was this MR needed?
This issue is needed to ensure an user to be logged in before creating an issue or MR
## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- Tests
  - [x] All builds are passing
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #25106

See merge request !7902