chore(vpcgw): remove v1 api

[yfodil]

Community Note

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.55%. Comparing base (68403f1) to head (59894b1).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/namespaces/vpcgw/v2/custom.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5390      +/-   ##
==========================================
- Coverage   55.57%   54.55%   -1.02%     
==========================================
  Files         322      317       -5     
  Lines       72649    70463    -2186     
==========================================
- Hits        40372    38444    -1928     
+ Misses      30771    30549     -222     
+ Partials     1506     1470      -36     

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