Improving logging and error readability for rke2-uninstall.sh script

[iamsarthakk]

Proposed Changes

Currently, whenever uninstall script fails it is not immediately clear that it failed and we need to address the failure issues. These changes adds clear messaging in red colour if the script fails at any point with better logging.

It doesn't need documentation changes

Types of Changes

Improving logging and error readability in rke2-uninstall script

Verification

Changes can be verified by running the uninstall script on rancher based system

Testing

It doesn't have any changes which need unit tests or integration tests

Linked Issues

User-Facing Change

NONE

Further Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.09%. Comparing base (71d00cc) to head (1058d39).
Report is 29 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6237      +/-   ##
==========================================
- Coverage   26.10%   26.09%   -0.01%     
==========================================
  Files          32       32              
  Lines        2697     2698       +1     
==========================================
  Hits          704      704              
- Misses       1947     1948       +1     
  Partials       46       46              

Flag	Coverage Δ
inttests	9.82% <ø> (-0.01%)	⬇️
unittests	18.57% <ø> (-0.01%)	⬇️

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