[Release 1.24] Add flannel-external-ip when there is a k3s node-external-ip

[manuelbuil]

Backport: #6180
Issue: #6188

[codecov-commenter]

Codecov Report

Base: 9.72% // Head: 9.71% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (0be4ef9) compared to base (a8e0c66).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.24   #6189      +/-   ##
===============================================
- Coverage          9.72%   9.71%   -0.01%     
===============================================
  Files               138     138              
  Lines             10060   10064       +4     
===============================================
  Hits                978     978              
- Misses             8883    8887       +4     
  Partials            199     199              

Flag	Coverage Δ
unittests	9.71% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/agent/flannel/flannel.go	0.00% <0.00%> (ø)
pkg/agent/run.go	0.00% <0.00%> (ø)

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