Align left metadata of work items to center

What does this MR do and why?

The alignment of the metadata was not in center. Align left metadata of work items to center.

Note: I was not able

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before	After

Note: I was not able to reproduce it on local gdk though exact data was feed. But this was observed in slack thread and OKR sandbox

How to set up and validate locally

Prerequisites:

1. Enable the OKRs feature as mentioned in the OKRs docs (e.g. ::Feature.enabled?(:okrs_mvc, Project.find(<PROJECT_ID>)) and the namespace must have Ultimate plan).

Steps to verify:

1. Login with any user
2. Go to any Project > Issues > List
3. Create an new Objective under New issue split button
4. Go to Objective detail page
5. Add a child item and open it in a modal by clicking on its link.
6. Add details like Milestone and Progress
7. Check if they are aligned properly in the child items list

Related to #428901 (closed), Slack thread