feat(vpcgw): add bastion_port validation for public gateway

[yfodil]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 1.77%. Comparing base (65e1a4c) to head (2ed9575).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/services/vpcgw/public_gateway.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #3482   +/-   ##
======================================
  Coverage    1.76%   1.77%           
======================================
  Files         405     405           
  Lines       44318   44273   -45     
======================================
  Hits          784     784           
+ Misses      43446   43401   -45     
  Partials       88      88           

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