[v24.1.x] rpk: allow configurable metric scrape count

[vbotbuildovich]

trafficstars

Backport of PR https://github.com/redpanda-data/redpanda/pull/23302

[JFlath]

@r-vasquez What's the best way of making the change? I can either do a whole new branch and PR, or try and commit to this branch, but that would require access to vbotbuildovich's fork, right?

[BenPope]

@r-vasquez What's the best way of making the change? I can either do a whole new branch and PR, or try and commit to this branch, but that would require access to vbotbuildovich's fork, right?

I usually create a new branch in my fork.

[github-actions[bot]]

This backport issue is being closed as version v24.1.x is no longer supported.