Extract issues list empty states to separate components

What does this MR do and why?

This MR extracts the group/project issues list empty states to separate components to organise the code more nicely

Screenshots or screen recordings

No visual changes

	signed in	signed out
group
project

How to set up and validate locally

Go to a group/project issues list with no issues and check the empty states

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.