Removed TestUtility in favor of Builder's test utility

[Blackbaud-SteveBrush]

Removed SKY UX's custom version of `expect` and `TestUtility`, in favor of Builder's equivalents.

[codecov-io]

Codecov Report

Merging #1598 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1598   +/-   ##
=======================================
  Coverage   99.98%   99.98%           
=======================================
  Files         391      391           
  Lines        7885     7885           
  Branches     1152     1152           
=======================================
  Hits         7884     7884           
  Misses          1        1

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