uncomment MacOS in Jenkins

[zacharyburnett]

This PR addresses the issue where MacOS artifacts have not been uploaded since October. The MacOS job was commented out because of an issue where sed was not available on boyle, which caused the regression tests to hang and fail. The sed issue has since been resolved.

Checklist for maintainers

• added entry in CHANGES.rst within the relevant release section
• updated or added relevant tests
• updated relevant documentation
• added relevant milestone
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

Base: 78.50% // Head: 78.50% // No change to project coverage 👍

Coverage data is based on head (2799353) compared to base (a467283).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7445   +/-   ##
=======================================
  Coverage   78.50%   78.50%           
=======================================
  Files         455      455           
  Lines       39195    39195           
=======================================
  Hits        30771    30771           
  Misses       8424     8424           

Flag	Coverage Δ
nightly	78.50% <ø> (ø)
unit	51.36% <ø> (ø)

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[zacharyburnett]

regtest passed at https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/555/console