Disable user commands light test on macOS

[chapulina]

🦟 Bug fix

Part of #634

Summary

The test fails consistently, see its history:

https://build.osrfoundation.org/job/ignition_gazebo-ci-ign-gazebo4-homebrew-amd64/102/testReport/(root)/INTEGRATION_user_commands/test_ran/history/

Let's disable it until we have time to look for an actual fix.

Checklist

• Signed all commits for DCO
• Added Removed tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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[codecov]

Codecov Report

Merging #1204 (7c41404) into ign-gazebo4 (f8942cd) will increase coverage by 0.01%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           ign-gazebo4    #1204      +/-   ##
===============================================
+ Coverage        66.40%   66.41%   +0.01%     
===============================================
  Files              250      250              
  Lines            19256    19256              
===============================================
+ Hits             12787    12789       +2     
+ Misses            6469     6467       -2     

Impacted Files	Coverage Δ
src/network/PeerInfo.cc	100.00% <0.00%> (+4.54%)	⬆️

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[osrf-triage]

This pull request has been mentioned on Gazebo Community. There might be relevant details there:

https://community.gazebosim.org/t/new-ignition-releases-2022-01-10/1228/1

[osrf-triage]

This pull request has been mentioned on Gazebo Community. There might be relevant details there:

https://community.gazebosim.org/t/new-ignition-releases-2022-01-24-citadel-edifice-fortress/1241/1

[osrf-triage]

This pull request has been mentioned on Gazebo Community. There might be relevant details there:

https://community.gazebosim.org/t/new-ignition-releases-2022-04-13-fortress-edifice/1367/1