32832 Remove overflow from comment form for confidential issues and vertically a…

What does this MR do?

Removes overflow from comment form for confidential issues and vertically aligns confidential issue icon

Screenshots (if relevant)

Before:

After:

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #32832 (closed)

Closes #32926 (closed)