Enforce coverage percentage

[l0b0]

Related Issue(s): #331

Description: Enforce the current level of code coverage, to make it easy to detect any substantial reduction and to bump it when coverage increases.

PR Checklist:

• Code is formatted (run scripts/format)
• Tests pass (run scripts/test)
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[codecov-commenter]

Codecov Report

Merging #365 (a00a61a) into main (543d17f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #365   +/-   ##
=======================================
  Coverage   89.43%   89.43%           
=======================================
  Files          36       36           
  Lines        4629     4629           
=======================================
  Hits         4140     4140           
  Misses        489      489           

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