Return back old project search behavior as default.

Add a `workspace::DeploySearch` action and use it as a default for "cmd-shift-f" binding.
This action opens existing search tab if it exists, or creates a new one otherwise.
`workspace::NewSearch` action is still available and always opens an existing search tab.

crates/workspace/src/workspace.rs

@@ -107,6 +107,7 @@ actions!(
         NewCenterTerminal,
         ToggleTerminalFocus,
         NewSearch,
+        DeploySearch,
         Feedback,
         Restart,
         Welcome,