Omit duplicate LSP data when generating completion item labels (#29137)

Before: 
<img width="875" alt="before"
src="https://github.com/user-attachments/assets/eec34f4e-3665-47e1-a224-16f1b98d5b29"
/>

After:
<img width="769" alt="after"
src="https://github.com/user-attachments/assets/4ce6a24b-6fd0-4043-b67c-c92105c1501a"
/>

Release Notes:

- N/A
4dcfe0cff9Kirill Bulatov committed on 4/21/2025, 2:24:51 AM· committed by GitHubparent4473b45
1 file changedLine totals unavailable