Issues list: spacing between labels

What does this MR do and why?

Issues list: spacing between labels:

• Equals spacing between items (x/y axis).
• Adds spacing which is missing with FF simplified_labels turned on

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

Issues

Before	After
simplified_labels enabled

MRs

Before	After
simplified_labels enabled

How to set up and validate locally

1. Go to an issue overview with an issue (with lots of labels)
2. Go to an overview with MRs (with a MR with lots of labels)
3. Enable/disable FF simplified_labels

Related to #430246 (closed), #438232