ci: Re-enable linux and macos matrix

[bthomee]

High Level Overview of Change

This change re-enables the Linux and macOS builds.

Context of Change

The builds were accidentally disabled in #6089 during testing.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Performance (increase or change in throughput and/or latency)
• Tests (you added tests for code that already exists, or your new feature included in this PR)
• Documentation update
• Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• Release

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.1%. Comparing base (813bc4d) to head (5008c1e).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #6107     +/-   ##
=========================================
- Coverage     79.1%   79.1%   -0.0%     
=========================================
  Files          839     839             
  Lines        71377   71377             
  Branches      8334    8336      +2     
=========================================
- Hits         56428   56425      -3     
- Misses       14949   14952      +3     

see 5 files with indirect coverage changes

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