Free up CI runner disk space before running UI tests.

[stefanceriu]

Fixes System.IO.IOException: No space left on device errors when running UI tests

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.

Generated by 🚫 Danger Swift against fde3bb5

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.05%. Comparing base (5394523) to head (fde3bb5).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3253   +/-   ##
========================================
  Coverage    71.05%   71.05%           
========================================
  Files          734      734           
  Lines        65131    65131           
========================================
+ Hits         46279    46282    +3     
+ Misses       18852    18849    -3     

Flag	Coverage Δ
unittests	68.82% <ø> (+0.03%)	⬆️

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