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Truncate commit messages in blame tooltip (#9937)

This truncates git commit messages to 15 lines.


Before:
![screenshot-2024-03-28-20 10
17@2x](https://github.com/zed-industries/zed/assets/1185253/03bea6bb-2ead-4bf6-bb12-22338c8745fd)

After:

![screenshot-2024-03-28-20 10
02@2x](https://github.com/zed-industries/zed/assets/1185253/0bd655ee-57ce-424f-b471-b7ce01e5fbf7)




Release Notes:

- N/A
3a36b10e3aThorsten Ball committed on 3/28/2024, 7:19:04 PM· committed by GitHubparent98adc7b
2 files changedLine totals unavailable