chore: update & simplify knip config

[webpro]

PR Checklist

• Addresses an existing open issue: resolves 🛠 Tooling: Knip reporting a false positive on NamespaceScope's finish #343 by ignoring (only) the erroneous class member (actually works around it)
• That issue was marked as status: accepting prs (I guess it should be listed here?)
• Steps in CONTRIBUTING.md were taken

Overview

Since Knip v4, the classMembers issue type should be enabled explicitly. That introduces the reported finish issue in --production mode, which unfortunately is still not fixed, but at least we can now ignore only that specific member. And merge two configs into one :)

[JoshuaKGoldberg]

LGTM, thanks - much appreciated! I'll defer to @RebeccaStevens as they set up the two Knip configs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.38%. Comparing base (a498fc2) to head (5ac5dda).
Report is 3 commits behind head on main.

❗ Current head 5ac5dda differs from pull request most recent head e6b36b5. Consider uploading reports for the commit e6b36b5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #416      +/-   ##
==========================================
+ Coverage   80.19%   80.38%   +0.18%     
==========================================
  Files          35       35              
  Lines        6575     6575              
  Branches      432      437       +5     
==========================================
+ Hits         5273     5285      +12     
+ Misses       1302     1290      -12     

Flag	Coverage Δ
4.3.5	80.16% <ø> (?)
4.6.4	80.19% <ø> (?)
4.9.5	80.19% <ø> (ø)
latest	80.16% <ø> (?)

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[RebeccaStevens]

Looks like this didn't auto merge. I'll merge it now.

Edit: looks like I can't @JoshuaKGoldberg could you merge this?

[webpro]

I think I figured out that the PR description did not match the template (there was no "fixes" or "resolves" keyword). Updated it.

[JoshuaKGoldberg]

@all-contributors please add @webpro for code.

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[allcontributors]

@JoshuaKGoldberg

I've put up a pull request to add @webpro! 🎉

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