[Release-1.27] Shell completion and etcd connection fix

[vitorsavian]

Proposed Changes

• backports from
• Rke2 shell completion #6305
• Fix external etcd connection #6355

Types of Changes

• backports

Verification

Testing

Linked Issues

• [Release-1.27] - RKE2 --datastore-endpoint for etcd not working #6616
• [Release-1.27] - Add shell completion support to RKE2 #6617

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 6.18557% with 91 lines in your changes missing coverage. Please review.

Project coverage is 25.20%. Comparing base (9e51142) to head (4ad8b9d).
Report is 1 commits behind head on release-1.27.

Files	Patch %	Lines
pkg/cli/cmds/completion.go	4.39%	87 Missing ⚠️
pkg/rke2/rke2_linux.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.27    #6615      +/-   ##
================================================
- Coverage         25.82%   25.20%   -0.63%     
================================================
  Files                32       33       +1     
  Lines              2722     2817      +95     
================================================
+ Hits                703      710       +7     
- Misses             1974     2063      +89     
+ Partials             45       44       -1     

Flag	Coverage Δ
inttests	9.51% <6.18%> (-0.12%)	⬇️
unittests	17.82% <0.00%> (-0.59%)	⬇️

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