Remove label color from global issue filters (#22660)

Remove label color from global issue filters (#22660)

The use of ui colors (red, green, etc) should be limited to actionable
or dismissable entries. Before this commit, a green/red label was used
to display issues count on each repository. This did not add any
meaningful information to the list.

Removing the label reduces ambiguity and makes the list easier to scan
visually.

![label_compare](https://user-images.githubusercontent.com/451841/215360696-a881b765-207d-4ffa-8bec-398f8e5dab1e.jpg)

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Co-authored-by: delvh <dev.lh@web.de>