Switched findTransformations and project to GET calls

[MikeTschudi]

"Solutions with feature services fail to deploy on Enterprise 11.5 MultiIWA"

One of the problems is a "401 Unauthorized" response to a findTransformations call. Because the docs say that findTransformations and project (its companion in the same function) can be GET calls, with this PR I'm switching both from POST to GET to see if that will help with this problem.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2c2fa17) to head (a3d1bf6).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop     #1526   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          153       153           
  Lines         8369      8369           
  Branches      1867      1925   +58     
=========================================
  Hits          8369      8369           

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