Use UnorderedElementsAreArray for JSB tests

[christophfroehlich]

Sames fix as in ros-controls/ros2_control#730

Closes #1123

I'm not sure if we should apply this patch to newer distros, because we never had this problem an newer RHEL versions.

[codecov]

Codecov Report

❌ Patch coverage is 48.97959% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.08%. Comparing base (6a78c5a) to head (391e500).
⚠️ Report is 1 commits behind head on humble.

Files with missing lines	Patch %	Lines
..._broadcaster/test/test_joint_state_broadcaster.cpp	48.97%	0 Missing and 25 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           humble    #1971   +/-   ##
=======================================
  Coverage   67.08%   67.08%           
=======================================
  Files         122      122           
  Lines       14549    14549           
  Branches     8987     8988    +1     
=======================================
  Hits         9760     9760           
  Misses       1463     1463           
  Partials     3326     3326           

Flag	Coverage Δ
unittests	67.08% <48.97%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
..._broadcaster/test/test_joint_state_broadcaster.cpp	47.22% <48.97%> (ø)

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[bmagyar]

thank you!