fix: avoid hint items shadow local item from completions #18517
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Relevant Issues
#18398 Don't auto import items when one is already in scope
#17164 Block specific items from being auto-imported
Fixed Problem
Now completions will not hint item that could shadow local item.
Problems that May Arise
Unexpected behavior
Maybe we can auto rename or use long path to disambiguation, and add a option to control the behavior.
Performance
This code use simple liner exhaustive search, maybe cause large performance problem in a big search space.