Make agent diff tab consistent with commit view tab (#60470)

This makes them more consistent with regards to limiting the label size.
These two tabs are similar because they frequently house a label that's
pretty big, and the agent diff tab didn't truncate it in any way.

Release Notes:

- N/A
717e1c0590Danilo Leal committed on 7/9/2026, 1:41:58 PM· committed by GitHubparentda4703b
1 file changedLine totals unavailable