fix: admission for ingress delete

[lingdie]

🤖[deprecated] Generated by Copilot at 1053cb8

Summary

🐛🚀📝

Fix a bug in the admission controller that causes it to crash when the ingressAnnotationString flag is not set. Move the logger initialization and add a flag validation in controllers/admission/cmd/main.go.

SetLogger first
Avoid parsing empty flag
Winter bug is fixed

Walkthrough

• Initialize the logger before using it in main.go (link)
• Validate the ingressAnnotationString flag before parsing it in main.go (link)

[sweep-ai]

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• Apply: All new business logic should have corresponding unit tests.
• Apply: Refactor large functions to be more modular.
• Apply: Add docstrings to all functions and file headers.

[sealos-ci-robot]

🤖 Generated by lychee action

Summary

Status	Count
🔍 Total	1045
✅ Successful	365
⏳ Timeouts	0
🔀 Redirected	0
👻 Excluded	679
❓ Unknown	0
🚫 Errors	0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e82b92f) 65.45% compared to head (1053cb8) 65.45%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4327   +/-   ##
=======================================
  Coverage   65.45%   65.45%           
=======================================
  Files           8        8           
  Lines         660      660           
=======================================
  Hits          432      432           
  Misses        180      180           
  Partials       48       48           

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