Install non-editable versions in CI

[desertaxle]

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• If this pull request adds new functionality, it includes unit tests that cover the changes
• If this pull request removes docs files, it includes redirect settings in mint.json.
• If this pull request adds functions or classes, it includes helpful docstrings.

[codspeed-hq]

CodSpeed Performance Report

Merging #17121 will not alter performance

_{Comparing pyproject-v2-fix-even-more-stuff (11c211e) with pyproject-v2 (14ea52f)}

Summary

✅ 2 untouched benchmarks