Adds execution status badge

What does this MR do and why?

This change adds an execution badge status to the runner list that will depending on if a runner is running jobs or not.

Both admin admin/runners and group (/groups/<my-group>/-/runners) runner lists are approved.

Changelog: added

Screenshots or screen recordings

A new Idle/Running badge has been added to show the execution status of a runner:

Badge in table context

How to set up and validate locally

1. Having at least one runner
2. Run any job, preferably a long running one (a few minutes)
3. In the job page, locate the runner that's running it on the right sidebar (e.g. Runner: #285 (coux-JMn) darwin-top-group-runner-1669300234-196)
4. Find that runner in the list (/admin/runnners for the admin list) and check that it's labeled as Running.
5. When the job is done, check that it is Idle

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.

Related to #372869 (closed)