Add hardware_interface_testing dependency

[christophfroehlich]

Was necessary and already included in #1326 and #1327, don't know why this succeeded on jazzy/rolling without.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.57%. Comparing base (fa42b5e) to head (bd23b8f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1335   +/-   ##
=======================================
  Coverage   80.57%   80.57%           
=======================================
  Files         109      109           
  Lines        9553     9553           
  Branches      832      832           
=======================================
  Hits         7697     7697           
  Misses       1578     1578           
  Partials      278      278           

Flag	Coverage Δ
unittests	80.57% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 2 files with indirect coverage changes