Need to show only the active agents.

[thinkthroo]

I attached a screenshot that shows previously deleted agents while assigning to an issue, this is a problem because if you assign to a deleted agent, it wil never run.

And we should also show the agent status offline or online, so it is more obvious

[thinkthroo]

Thanks for opening your issue, @thinkthroo[bot]! 🎉

We appreciate you taking the time to contribute to the project.
Someone will respond to your issue soon. 👍