Fix double confirmation modal bug on work items page

What does this MR do and why?

This MR fixes a double confirmation modal bug on the work items page

Behind feature flags okrs_mvc and work_items_mvc_2

Screenshots or screen recordings

Before	After
Screen_Recording_2023-06-06_at_3.26.09_pm	Screen_Recording_2023-06-06_at_3.28.15_pm

How to set up and validate locally

1. In rails console enable the feature flags

   Feature.enable(:okrs_mvc)
   Feature.enable(:work_items_mvc_2)

2. Visit an issues list page, e.g. http://127.0.0.1:3000/flightjs/flight/-/issues/
3. Create an Objective from the New issue toggle button
4. Open the Objective then create child Objectives/KRs
5. Test this MR

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.