Fixed work item weight subscription to prevent invalidating cache - on hold till a common solution is figured out

What does this MR do and why?

In continuation to Fixed work item subscriptions to prevent invali... (!100728 - merged) , fixing the work item weight subscription as well .

Screenshots or screen recordings

Before	After
before_weight	Screen_Recording_2022-10-12_at_1.32.04_PM

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Example below:

1. Enable the work items feature flags

   Feature.enable(:work_items)
   Feature.enable(:work_items_mvc_2)

2. Visit any work items such as http://127.0.0.1:3000/groups/flightjs/-/work_items/2

3. Update the weight

4. Check the Network tab: there should be no workItem query calls after workItemUpdate

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.