fix(cni): change log level to error for failed OVN mp0 IP indexing

[pellared]

Change log level from INFO to ERROR for failed OVN mp0 IP indexing.

Add a comment from where the fix for #1030 comes from.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 20.60%. Comparing base (cf73870) to head (477af43).

Files with missing lines	Patch %	Lines
pkg/kube/kubecache/meta/cni/ovn_kubernetes.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1063      +/-   ##
==========================================
- Coverage   20.60%   20.60%   -0.01%     
==========================================
  Files         219      219              
  Lines       25048    25049       +1     
==========================================
  Hits         5162     5162              
- Misses      19287    19288       +1     
  Partials      599      599              

Flag	Coverage Δ
integration-test	22.86% <0.00%> (ø)
integration-test-arm	0.00% <0.00%> (ø)
k8s-integration-test	2.64% <0.00%> (ø)
oats-test	0.00% <0.00%> (ø)

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