Reverts "add OpenExcerptsSplit and dispatches on click" (#42538)

Partially reverts https://github.com/zed-industries/zed/pull/42283 to
restore the old behavior of excerpt clicking.

Release Notes:

- N/A
1d75a9c4b2Smit Barmase committed on 11/12/2025, 3:17:29 PM· committed by GitHubparentc5ab1d4
1 file changedLine totals unavailable