Resolve "Use $EDITOR or another Environment variable to open the new Changelog entry directly in your editor"

What does this MR do?

Opens your specified text editor when creating a new changelog entry

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Review
  • Has been reviewed by Backend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

Closes #44488 (closed)