Fix issue ID wrapping and avatar counter shrinking in Related Issues list

What does this MR do?

This MR fixes following regression bugs for Related Issues list (available under Epics and Issues);

• Issue ID would wrap to individual digits when horizontal space is unavailable due to lengthy issue title.
• Avatar counter width would shrink in lengthy issue title.

Screenshots

Before	After

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] Documentation created/updated
• [ ] Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• [ ] Conforms to the database guides
• ~~[ ] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.~~
• EE specific content should be in the top level /ee folder
• [ ] For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?
• [ ] Security reports checked/validated by reviewer

Closes #8850 (closed)