Remove duplicated BS display properties from Issuable Notes

What does this MR do?

Removes duplicated BS display properties from Issuable Notes.

Screenshots (strongly suggested)

Page	After (PC)	After (Mobile)
MR comment form (no regressions)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines
• Style guides
• Separation of EE specific content

Availability and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Part of #270065 (closed)