Revert "Merge branch 'fe-fix-incorrect-mitt-usage' into 'master'"

What does this MR do?

This MR reverts the changes made in !34242 (merged) because it does not take into account situations where no arguments are emitted.

It also replaces the create_event_hub implementation with a Vue instance so that we aren't reintroducing the old bugs which used the multiple argument emits.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• [ ] Changelog entry Not needed since this is fixed in the same milestone.
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content