fix(lb): add a test for double private network creation and attach

[remyleone]

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[codecov-commenter]

Codecov Report

Merging #1236 (4f3c2a3) into master (7a04fe0) will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1236   +/-   ##
======================================
  Coverage    1.45%   1.45%           
======================================
  Files         100     100           
  Lines       16099   16099           
======================================
  Hits          235     235           
  Misses      15841   15841           
  Partials       23      23           

Impacted Files	Coverage Δ
scaleway/resource_lb.go	0.00% <ø> (ø)

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