Add /award quick action for work items

What does this MR do and why?

Add /award :emoji quick action for work items.

This action essentially adds an emoji reaction to the work item.

Screenshots or screen recordings

Screen_Recording_2023-07-31_at_08.03.27

How to set up and validate locally

1. In rails console, enable the feature flag:

Feature.enable(:krs_mvc)

2. Navigate to your test project.
3. On the left sidebar, select Plan > Issues
4. In the upper-right corner, next to New issue, select the down arrow and then select New objective.
5. Select New objective again.
6. Select Create objective.
7. In the comment box, type /award :rocket:
8. Save the comment, and refresh the page
9. The Objective should now have an emoji reaction showing 🚀

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.