feat(vpc): parallelize private-network get with errgroup

[yfodil]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.96970% with 3 lines in your changes missing coverage. Please review.

Project coverage is 55.15%. Comparing base (5bf53e0) to head (d66c049).
Report is 637 commits behind head on master.

Files with missing lines	Patch %	Lines
...ternal/namespaces/vpc/v2/custom_private_network.go	96.96%	2 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (d66c049). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (d66c049)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4754       +/-   ##
===========================================
- Coverage   75.45%   55.15%   -20.30%     
===========================================
  Files         202      312      +110     
  Lines       44323    80011    +35688     
===========================================
+ Hits        33444    44131    +10687     
- Misses       9653    34472    +24819     
- Partials     1226     1408      +182     

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