Improve Find/Replace shortcuts (#10297)

This PR changes ways the Find/Replace functionality in the
Buffer/Project Search is accessible via shortcuts. It makes those panels
work the same way as in VS Code and Sublime Text.

The details are described in the issue: [Make Find/Replace easier to
use](https://github.com/zed-industries/zed/issues/9142)

There's a difficulty with the Linux keybindings:

VS Code uses on MacOS (this PR replicates it):

| Action | Buffer Search | Project Search |
| --- | --- | --- |
| Find | `cmd-f` | `cmd-shift-f` |
| Replace | `cmd-alt-f` | `cmd-shift-h` |

VS Code uses on Linux (this PR replicates all but one):

| Action | Buffer Search | Project Search |
| --- | --- | --- |
| Find | `ctrl-f` | `ctrl-shift-f` |
| Replace | `ctrl-h` ❗ | `ctrl-shift-h` |

The problem is that `ctrl-h` is already taken by the `editor::Backspace`
action in Zed on Linux.

There's two options here:

1. Change keybinding for `editor::Backspace` on Linux to something else,
and use `ctrl-h` for the "replace in buffer" action.
2. Use some other keybinding on Linux in Zed. This PR introduces
`ctrl-r` for this purpose, though I'm not sure it's the best choice.

What do you think?

fixes #9142

Release Notes:

- Improved access to "Find/Replace in Buffer" and "Find/Replace in
Files" via shortcuts (#9142).

Optionally, include screenshots / media showcasing your addition that
can be included in the release notes.

- N/A

crates/workspace/src/pane.rs

@@ -86,6 +86,12 @@ pub struct RevealInProjectPanel {
     pub entry_id: Option<u64>,
 }
 
+#[derive(PartialEq, Clone, Deserialize)]
+pub struct DeploySearch {
+    #[serde(default)]
+    pub replace_enabled: bool,
+}
+
 impl_actions!(
     pane,
     [
@@ -93,7 +99,8 @@ impl_actions!(
         CloseActiveItem,
         CloseInactiveItems,
         ActivateItem,
-        RevealInProjectPanel
+        RevealInProjectPanel,
+        DeploySearch,
     ]
 );
 
@@ -107,7 +114,6 @@ actions!(
         CloseItemsToTheLeft,
         CloseItemsToTheRight,
         GoBack,
-        DeploySearch,
         GoForward,
         ReopenClosedItem,
         SplitLeft,
@@ -117,6 +123,14 @@ actions!(
     ]
 );
 
+impl DeploySearch {
+    pub fn find() -> Self {
+        Self {
+            replace_enabled: false,
+        }
+    }
+}
+
 const MAX_NAVIGATION_HISTORY_LEN: usize = 1024;
 
 pub enum Event {