Use native CMake functionality for stripping trailing whitespace

[knoepfel]

Hat tip to @greenc-FNAL

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

❌ Your project status has failed because the head coverage (74.31%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

@@            Coverage Diff             @@
##             main     #285      +/-   ##
==========================================
+ Coverage   74.28%   74.31%   +0.03%     
==========================================
  Files         124      124              
  Lines        2955     2955              
  Branches      513      513              
==========================================
+ Hits         2195     2196       +1     
  Misses        540      540              
+ Partials      220      219       -1     

Flag	Coverage Δ
unittests	74.31% <ø> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.
see 1 file with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 040a4e6...efaec58. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.