feat(terway): add WriteCNIConfFirst feature gate

[l1b0k]

• Introduce new feature gate for writing CNI configuration first
• Implement feature gate parsing and setting in main.go
• Add condition to skip CNI configuration writing in server.go
• Update hack/init.sh script to handle WriteCNIConfFirst flag
• Register WriteCNIConfFirst feature in feature.go

[codecov]

Codecov Report

❌ Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.39%. Comparing base (a19db68) to head (eb28f6d).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/terway/main.go	0.00%	7 Missing ⚠️
daemon/server.go	0.00%	3 Missing and 1 partial ⚠️

❌ Your project status has failed because you have indirect coverage changes. Learn more about Unexpected Coverage Changes and reasons for indirect coverage changes.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #915      +/-   ##
==========================================
- Coverage   59.44%   59.39%   -0.05%     
==========================================
  Files         131      131              
  Lines       19545    19556      +11     
==========================================
- Hits        11618    11616       -2     
- Misses       6779     6790      +11     
- Partials     1148     1150       +2     

Flag	Coverage Δ
unittests	59.39% <0.00%> (-0.05%)	⬇️

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