Improve Block Production panels

[twoeths]

Describe the bug

There are bad labels on block production grafana panels

Expected behavior

Deduplicate the label, add more prefix/suffix to labels

[twoeths]

also below panels should have short label

[wemeetagain]

@twoeths is this still an issue?

[nflaig]

at least for builder api times, I have a fix ready, just haven't opened a PR yet