[Release-1.27] Fix for kill all to not delete the data dir

[vitorsavian]

• Issue: [Release-1.27] - Killall script should not unmount /var/lib/rancher/rke2/(server|agent) #6565
• 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 25.82%. Comparing base (f0fae2a) to head (e5113fe).

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.27    #6566   +/-   ##
=============================================
  Coverage         25.82%   25.82%           
=============================================
  Files                32       32           
  Lines              2722     2722           
=============================================
  Hits                703      703           
  Misses             1974     1974           
  Partials             45       45           

Flag	Coverage Δ
inttests	9.62% <ø> (ø)
unittests	18.40% <ø> (ø)

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