Return back to history-based tabs activation on close (#19150)

Closes https://github.com/zed-industries/zed/issues/19036

Alters https://github.com/zed-industries/zed/pull/18168 and moves its
change behind a settings flag, restoring the previous behavior.

Release Notes:

- Fixed tab closing not respecting history. Use `tabs.activate_on_close
= neighbour` settings to activate near tabs instead.