Fix ctrl/cmd-w closing the project panel instead of the active pane (#64515)

Closes https://github.com/zed-industries/zed/issues/34865
Closes https://github.com/zed-industries/zed/discussions/41122

Follows an Intellij Idea approach, where these bindings are separate.

Release Notes:

- Fixed `ctrl/cmd-w` closing the project panel instead of the active
pane. BREAKING: closing the active dock moved from `cmd/ctrl-w` to
`ctrl-alt-w`

assets/keymaps/default-linux.json

@@ -737,8 +737,9 @@
       // or by tag:
       // "foo-bar": ["task::Spawn", { "task_tag": "MyTag" }],
       "f5": "debugger::Rerun",
-      "ctrl-f4": "workspace::CloseActiveDock",
-      "ctrl-w": "workspace::CloseActiveDock",
+      "ctrl-f4": ["pane::CloseActiveItem", { "close_pinned": false }],
+      "ctrl-w": ["pane::CloseActiveItem", { "close_pinned": false }],
+      "ctrl-alt-w": "workspace::CloseActiveDock",
     },
   },
   {

assets/keymaps/default-macos.json

@@ -777,7 +777,8 @@
       "cmd-k shift-down": "workspace::SwapPaneDown",
       "cmd-shift-x": "zed::Extensions",
       "f5": "debugger::Rerun",
-      "cmd-w": "workspace::CloseActiveDock",
+      "cmd-w": ["pane::CloseActiveItem", { "close_pinned": false }],
+      "ctrl-alt-w": "workspace::CloseActiveDock",
     },
   },
   {

assets/keymaps/default-windows.json

@@ -725,8 +725,9 @@
       // or by tag:
       // "foo-bar": ["task::Spawn", { "task_tag": "MyTag" }],
       "f5": "debugger::Rerun",
-      "ctrl-f4": "workspace::CloseActiveDock",
-      "ctrl-w": "workspace::CloseActiveDock",
+      "ctrl-f4": ["pane::CloseActiveItem", { "close_pinned": false }],
+      "ctrl-w": ["pane::CloseActiveItem", { "close_pinned": false }],
+      "ctrl-alt-w": "workspace::CloseActiveDock",
     },
   },
   {