perf(controller): optimize NetworkInterface CR handling with a map

[l1b0k]

• List all existing NetworkInterface CRs to avoid multiple Get requests
• Build a map for fast lookup
• Use the map to check if a NetworkInterface CR exists before creation
• Update the syncNetworkInterfaceCR function to use the existence check

[codecov]

Codecov Report

❌ Patch coverage is 86.95652% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.41%. Comparing base (9dedc55) to head (5357a6c).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controller/pod-eni/eni_controller.go	86.95%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #909   +/-   ##
=======================================
  Coverage   59.40%   59.41%           
=======================================
  Files         131      131           
  Lines       19543    19545    +2     
=======================================
+ Hits        11610    11612    +2     
  Misses       6784     6784           
  Partials     1149     1149           

Flag	Coverage Δ
unittests	59.41% <86.95%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Copilot]

Pull Request Overview

This PR optimizes NetworkInterface CR handling in the migration function by reducing API calls through efficient lookup patterns. Instead of making individual Get requests for each NetworkInterface CR, it lists all existing CRs once and builds a map for fast lookups.

• Replace individual Get requests with a single List operation and map-based lookups
• Modify syncNetworkInterfaceCR to accept an existence flag parameter
• Streamline the CR creation/update logic by eliminating redundant API calls

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}