Switch from delete file by default to trash file by default (#10875)

TODO:

- [x] Don't immediately seg fault
- [x] Implement for directories 
- [x] Add cmd-delete to remove files
- [ ] ~~Add setting for trash vs. delete~~ You can just use keybindings
to change the behavior.

fixes https://github.com/zed-industries/zed/issues/7228
fixes https://github.com/zed-industries/zed/issues/5094

Release Notes:

- Added a new `project_panel::Trash` action and changed the default
behavior for `backspace` and `delete` in the project panel to send a
file to the systems trash, instead of permanently deleting it
([#7228](https://github.com/zed-industries/zed/issues/7228),
[#5094](https://github.com/zed-industries/zed/issues/5094)). The
original behavior can be restored by adding the following section to
your keybindings:

```json5
[
// ...Other keybindings...
  {
    "context": "ProjectPanel",
    "bindings": {
        "backspace": "project_panel::Delete",
        "delete": "project_panel::Delete",
    }
  }
]

crates/collab/src/tests/integration_tests.rs

@@ -3190,7 +3190,7 @@ async fn test_fs_operations(
 
     project_b
         .update(cx_b, |project, cx| {
-            project.delete_entry(dir_entry.id, cx).unwrap()
+            project.delete_entry(dir_entry.id, false, cx).unwrap()
         })
         .await
         .unwrap();
@@ -3218,7 +3218,7 @@ async fn test_fs_operations(
 
     project_b
         .update(cx_b, |project, cx| {
-            project.delete_entry(entry.id, cx).unwrap()
+            project.delete_entry(entry.id, false, cx).unwrap()
         })
         .await
         .unwrap();