Enable macOS runners in CI workflows

[lbianchi-lbl]

Summary/Motivation:

• Add macOS runners to GHA job matrix to see how much of the test suite is supported

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[codecov[bot]]

Codecov Report

Merging #895 (99fbdd5) into main (5657571) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #895      +/-   ##
==========================================
- Coverage   70.06%   70.06%   -0.01%     
==========================================
  Files         573      573              
  Lines       63981    63981              
  Branches    12046    12046              
==========================================
- Hits        44829    44826       -3     
- Misses      16866    16870       +4     
+ Partials     2286     2285       -1     

Impacted Files	Coverage Δ
idaes/ver.py	61.53% <0.00%> (-4.62%)	:arrow_down:

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[ksbeattie]

@lbianchi-lbl is working on this

[ksbeattie]

This is some good news: https://github.blog/changelog/2022-08-09-github-actions-self-hosted-runners-now-support-apple-m1-hardware/

[eslickj]

Since we have everything but HSL, maybe we can just tag the tests that require HSL and not run them for Intel macOS? I think 62 fail, but including integration (I think). https://github.com/IDAES/idaes-ext/actions/runs/4244093378/jobs/7377718944

[lbianchi-lbl]

This approach is not needed anymore since we now have actual (albeit HSL-less) idaes-ext builds for macOS x86_64. We'll close this and open a new PR adding macOS to GHA without the conda-forge Ipopt workaround.