Add issues to epic and related issues using modal similar to issue boards
- Currently in the issue board, you can add issues to it with the modal UI.
- This is a powerful UI which allows you to quickly search and filter issues, and also select multiple of them, and then add them all at once.
- This same UI can be applied to the issues UI of an epic and related issues to get the same UX benefits. Instead of having to paste in issue links or type in issue ids, you can quickly find the issues you care about, and make the associations in a few clicks, instead of managing issue links in your clipboard.
- This can be a modal or similar to issue boards, or some other UI. The main idea is that you have the ability to search for issues and select multiple of them easily.