fix(vpc): handle IPAM errors gracefully in private-network get

[yfodil]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

❌ Patch coverage is 35.29412% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.34%. Comparing base (abff741) to head (d34b704).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ternal/namespaces/vpc/v2/custom_private_network.go	35.29%	11 Missing and 11 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5224      +/-   ##
==========================================
- Coverage   58.36%   58.34%   -0.03%     
==========================================
  Files         311      311              
  Lines       68512    68522      +10     
==========================================
- Hits        39990    39980      -10     
- Misses      27037    27047      +10     
- Partials     1485     1495      +10     

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