Format DAG run count

[rafaelleinio]

DAGs with many runs are badly formatted inside the circle.

Current:

What I think could be better:

---

^ Add meaningful description above
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[raphaelauv]

then I think we need to add an overlay to show the real value

[jscheffl]

+1 to comment of @raphaelauv - really like this and I had also challenges in the past with 100k+ DAG runs in our environment.

Can you add a "title" which just renders a pop-up with you run with the mouse over it? Then I think it is OK to approve and merge.