Fix kill all script to not delete data dir

[vitorsavian]

Proposed Changes

Types of Changes

• Bugfix

Verification

• Install rke2 and mount the server folder with

mount --bin /var/lib/rancher/rke2/server /var/lib/rancher/rke2/server

and then use the kill all script

rke2-killall.sh

Testing

Linked Issues

• Killall script should not unmount /var/lib/rancher/rke2/(server|agent) #6557

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.18%. Comparing base (db057b8) to head (587fb7f).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6558      +/-   ##
==========================================
- Coverage   25.25%   25.18%   -0.08%     
==========================================
  Files          33       33              
  Lines        2831     2831              
==========================================
- Hits          715      713       -2     
- Misses       2070     2071       +1     
- Partials       46       47       +1     

Flag	Coverage Δ
inttests	9.57% <ø> (-0.08%)	⬇️
unittests	17.80% <ø> (ø)

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