refactor(pod-eni): optimize node handling for LinJun nodes

[l1b0k]

• Update code to handle LinJun nodes specifically
• Improve logic for determining ECS high density nodes
• Refactor node retrieval to support different API versions

[codecov]

Codecov Report

❌ Patch coverage is 16.66667% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.16%. Comparing base (d9e747c) to head (0acbb31).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controller/pod-eni/eni_controller.go	16.66%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #907      +/-   ##
==========================================
+ Coverage   59.14%   59.16%   +0.01%     
==========================================
  Files         131      131              
  Lines       19529    19543      +14     
==========================================
+ Hits        11550    11562      +12     
- Misses       6833     6835       +2     
  Partials     1146     1146              

Flag	Coverage Δ
unittests	59.16% <16.66%> (+0.01%)	⬆️

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