Fix external etcd connection

[vitorsavian]

Proposed Changes

• A bugfix for when the user uses datastore endpoint with etcd endpoints

Types of Changes

• Bugfix

Verification

• Run rke2 with a external etcd instance

Testing

Linked Issues

• RKE2 --datastore-endpoint for etcd not working #6194

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 25.25%. Comparing base (b704157) to head (5452dcb).
Report is 76 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/rke2/rke2_linux.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6355      +/-   ##
==========================================
+ Coverage   25.23%   25.25%   +0.01%     
==========================================
  Files          33       33              
  Lines        2829     2831       +2     
==========================================
+ Hits          714      715       +1     
- Misses       2068     2070       +2     
+ Partials       47       46       -1     

Flag	Coverage Δ
inttests	9.64% <0.00%> (-0.01%)	⬇️
unittests	17.80% <0.00%> (+0.02%)	⬆️

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