Move ulimit check to install phase and switch user to reflect changes…

[dreambeyondorange]

… to the config

Until now ulimit -Sn was used in the config step to confirm the changes in the install step are reflected in the running OS. This is no longer working in Ubuntu 22 because for whatever reason, the session that is created for Ubuntu 22 doesn't have the changes reflected, even though the files are in place. After launching an instance from the AMI however, the changes are there. To improve this test, we need to move it to the install step and check it immediately by switching users and forcing the loading of the limits.

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[codecov]

Codecov Report

Merging #2394 (d995141) into develop (828a0b2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #2394   +/-   ##
========================================
  Coverage    70.34%   70.34%           
========================================
  Files           13       13           
  Lines         1851     1851           
========================================
  Hits          1302     1302           
  Misses         549      549           

Flag	Coverage Δ
unittests	70.34% <ø> (ø)

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