Try fixing flaky network test

[majst01]

Description

test-network often fails with the same error, asking deepseek for potential fix came up with this one.

TBH i do not yet fully understand the fix :-(

Explanation:

What changed: The "ensure parent prefix exists in ipam" loop was hoisted out of the if namespace != nil block so it now runs for both namespaced and non-namespaced super networks. CreateNamespace still only runs for the namespaced case; then, for every parent prefix of the requested family, it does a GetPrefix and, if missing (NotFound), a CreatePrefix in the target namespace (the default root namespace for non-namespaced supers).

Why this fixes the flake: Previously, for a non-namespaced super, createChildPrefix called AcquireChildPrefix directly and relied on the parent prefix having been created earlier. go-ipam's AcquireChildPrefix maps a missing parent to InvalidArgument, not NotFound, so the errorutil.IsNotFound(err) { continue } guard never caught it — a transiently missing parent (e.g. from DeleteNetworks resetting ipam state between the sequential subtests) surfaced as the reported internal: NotFound prefix not found. Now the parent is deterministically materialized before allocation, independent of prior ipam state.

Used AI-Tools ✨

• Deepseek V4 flash used for generation

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.90%. Comparing base (bb7c6ce) to head (8086de3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/repository/network.go	86.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #304      +/-   ##
==========================================
- Coverage   79.93%   79.90%   -0.03%     
==========================================
  Files         199      199              
  Lines       14800    14800              
==========================================
- Hits        11830    11826       -4     
- Misses       2969     2973       +4     
  Partials        1        1              

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