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Allow codebase search to be turned on or off within the composer for assistant2 (#11315)

![image](https://github.com/zed-industries/zed/assets/836375/e03d2357-e2e4-49f1-86d6-7593bce13618)


![image](https://github.com/zed-industries/zed/assets/836375/3d769622-82e1-4e6f-bdec-4dce81e43423)


![image](https://github.com/zed-industries/zed/assets/836375/bf79a4ec-1660-47b1-8525-e741575dc5d4)

Release Notes:

- N/A
1915a756a0Kyle Kelley committed on 5/2/2024, 8:26:46 PM· committed by GitHubparent43ad470
8 files changedLine totals unavailable