[Release-1.28] Fix for kill all to not delete the data dir

[vitorsavian]

• Issue: [Release-1.28] - Killall script should not unmount /var/lib/rancher/rke2/(server|agent) #6561
• Backport from: Fix kill all script to not delete data dir #6558

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.18%. Comparing base (4e93720) to head (2150ddf).

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.28    #6563   +/-   ##
=============================================
  Coverage         25.18%   25.18%           
=============================================
  Files                33       33           
  Lines              2831     2831           
=============================================
  Hits                713      713           
  Misses             2071     2071           
  Partials             47       47           

Flag	Coverage Δ
inttests	9.57% <ø> (ø)
unittests	17.80% <ø> (ø)

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