Remove excessive jQuery usage from Vue components (part 2)

What does this MR do and why?

Part of jQuery removal effort. This change removes jQuery from Vue components where its usage could be avoided at minimal cost.

A follow-up of Remove excessive jQuery usage from Vue components (!107095 - merged)

Validation steps

Smoke test system notes

1. Open any merge request
2. Change milestone or add any label
3. System note should appear correctly in the Activity feed

System note commits functionality

1. Open any merge request
2. Push at least 4 commits to the MR working branch
3. You should see a similar interface:

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.