project_search: Add ability to search only for opened files (#16580)

Any suggestion?

Release Notes:
  - add ability for project search only for opend files.

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/collab/src/tests/integration_tests.rs

@@ -4920,6 +4920,7 @@ async fn test_project_search(
                 false,
                 Default::default(),
                 Default::default(),
+                None,
             )
             .unwrap(),
             cx,

crates/collab/src/tests/random_project_collaboration_tests.rs

@@ -883,6 +883,7 @@ impl RandomizedTest for ProjectCollaborationTest {
                             false,
                             Default::default(),
                             Default::default(),
+                            None,
                         )
                         .unwrap(),
                         cx,