Edit text in issues empty state for not logged users

What does this MR do and why?

• changes text in empty issues state
• updates auto-tests related to issues with empty state

Solves: #371545 (closed)

Screenshots or screen recordings

Old:

New:

How to set up and validate locally

1. Create respository or find an existing one without issues
2. Open this repository's issues. URL example: http://localhost:3000/root/empty-issues-project/-/issues

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.