Update coverage call, don't install in editable mode in testing

[rly]

Motivation

Analogous to https://github.com/hdmf-dev/hdmf/pull/1107

https://setuptools.pypa.io/en/latest/userguide/development_mode.html says

Editable installs are not a perfect replacement for regular installs in a test environment. When in doubt, please test your projects as installed via a regular wheel. There are tools in the Python ecosystem, like tox or nox, that can help you with that (when used with appropriate configuration).

We use editable installs in testing in a couple places, mostly to help coverage find the sources, but we can configure that in pyproject.toml instead.

How to test the behavior?

Run all GitHub actions

Checklist

• [x] Did you update CHANGELOG.md with your changes?
• [x] Have you checked our Contributing document?
• [x] Have you ensured the PR clearly describes the problem and the solution?
• [x] Is your contribution compliant with our coding style? This can be checked running ruff from the source directory.
• [x] Have you checked to ensure that there aren't other open Pull Requests for the same change?
• [x] Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.42%. Comparing base (5fd5c58) to head (5e64119).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #188 +/- ## ========================================== - Coverage 86.05% 84.42% -1.64% ========================================== Files 5 5 Lines 1162 1162 Branches 287 287 ========================================== - Hits 1000 981 -19 - Misses 107 126 +19 Partials 55 55 ```

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