feat(s2s_vpn): support single tunnel ip auto-alloc

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.47%. Comparing base (3d8e361) to head (1bcf390).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...nternal/namespaces/s2s_vpn/v1alpha1/s2s_vpn_cli.go	0.00%	20 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5321      +/-   ##
==========================================
- Coverage   55.48%   55.47%   -0.02%     
==========================================
  Files         320      320              
  Lines       72173    72193      +20     
==========================================
  Hits        40046    40046              
- Misses      30633    30653      +20     
  Partials     1494     1494              

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