[PR] chore: [chore] update .gitignore to save .idea/icon.png [hertzbeat]

[via GitHub]

yuluo-yx opened a new pull request, #1971:
URL: https://github.com/apache/hertzbeat/pull/1971

   ## What's changed?
   
   When editing code in idea, icon.png in .idea folder may be ignored, this 
update will keep icon.png in git add to avoid deleting icon.png.
   
   ## Checklist
   
   - [ ]  I have read the [Contributing 
Guide](https://hertzbeat.apache.org/docs/community/code_style_and_quality_guide)
   - [ ]  I have written the necessary doc or comment.
   - [ ]  I have added the necessary unit tests and all cases have passed.
   
   ## Add or update API
   
   - [ ] I have added the necessary [e2e 
tests](https://github.com/apache/hertzbeat/tree/master/e2e) and all cases have 
passed.
   


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