feat(s2s_vpn): add support for importing custom PSK

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.08%. Comparing base (88e1f5e) to head (c44ed63).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...nternal/namespaces/s2s_vpn/v1alpha1/s2s_vpn_cli.go	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5602      +/-   ##
==========================================
- Coverage   51.09%   51.08%   -0.01%     
==========================================
  Files         340      340              
  Lines       77332    77342      +10     
==========================================
  Hits        39509    39509              
- Misses      36332    36342      +10     
  Partials     1491     1491              

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