Remove flannel external-ip annotations when disabled

[brandond]

Proposed Changes

Remove flannel external-ip annotations when disabled

Types of Changes

bugfix

Verification

See linked issue

Testing

Linked Issues

• Changing flannel-external-ip from true to false has no effect #13388

User-Facing Change

Further Comments

[codecov]

Codecov Report

❌ Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 21.59%. Comparing base (2ef2865) to head (5f27e89).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/agent/flannel/setup.go	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13431      +/-   ##
==========================================
- Coverage   21.60%   21.59%   -0.02%     
==========================================
  Files         189      189              
  Lines       15382    15391       +9     
==========================================
  Hits         3323     3323              
- Misses      11606    11615       +9     
  Partials      453      453              

Flag	Coverage Δ
unittests	21.59% <0.00%> (-0.02%)	⬇️

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