Fix escape name in assignYourself

What does this MR do?

Fix the display of escaped characters when using the 'assign to me' button on issues.

Previously !14170 (closed) was opened against this issue, but was not merged. This MR keeps the _.escape call on the data needed and uses a template literal to create the input element holding the data instead of document.createElement

Before

After

What are the relevant issue numbers?

#37673 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• 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.
• Security reports checked/validated by reviewer

Closes #37673 (closed)