Allow hovering over tooltips in git blame sidebar (#10466)

This introduces a new API on `StatefulInteractiveElement` to create a
tooltip that can be hovered, scrolled inside, and clicked:
`.hoverable_tooltip`.

Right now we only use it in the `git blame` gutter, but the plan is to
use the new hover/click/scroll behavior in #10398 to introduce new
git-blame-tooltips.

Release Notes:

- N/A

---------

Co-authored-by: Antonio <antonio@zed.dev>

crates/editor/src/element.rs

@@ -2969,7 +2969,7 @@ fn render_blame_entry(
                 cx.open_url(url.as_str())
             })
         })
-        .tooltip(move |cx| {
+        .hoverable_tooltip(move |cx| {
             BlameEntryTooltip::new(
                 sha_color.cursor,
                 commit_message.clone(),