Add progress changes to activity

Abhilash Kotterequested to merge
add-progress-changes-activity into master

What does this MR do and why?

Display progress changes in System Notes

reference: #386868 (closed)

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests. Screenshot_2023-01-04_at_6.31.32_PM

How to set up and validate locally

  1. Open rails console by running bin/rails console within GDK directory.
  2. Enable the feature flag :hierarchy_db_restrictions on a project; Feature.enable(:hierarchy_db_restrictions).
  3. Enable the feature flag :okrs_mvc on the same project; Feature.enable(:okrs_mvc).
  4. Visit issues list page for the project by navigating to http://gdk.test:3000/gitlab-org/gitlab-test/-/issues.
  5. Create an objective by clicking on dropdown button next to New issue and selecting New objective from the dropdown.
  6. Once objective is created, click on it to visit its Work Item page, you should be able to see Tree View below the description.
  7. Use Add dropdown button create/add key results. 1.Try changing the progress for the Objective and you should see the relevant change in the activity timeline below
  8. Click on any KR to go to it's page and repeat the step

MR acceptance checklist

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

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