keymap: Update Prev to Previous for consistency (#25909)

Closes #10167

This is take 2 on https://github.com/zed-industries/zed/pull/2341 which
was closed due to lack of migrator.

This PR contains rename of following keymap actions: 
```sh
1. ["editor::GoToPrevHunk", { "center_cursor": true }] -> ["editor::GoToPreviousHunk", { "center_cursor": true }]
2. "editor::GoToPrevDiagnostic" -> "editor::GoToPreviousDiagnostic"
3. "editor::ContextMenuPrev" -> "editor::ContextMenuPrevious"
4. "search::SelectPrevMatch" -> "search::SelectPreviousMatch"
5. "file_finder::SelectPrev" -> "file_finder::SelectPrevious"
6. "menu::SelectPrev" -> "menu::SelectPrevious"
7. "editor::TabPrev" -> "editor::Backtab"
```

Release Notes:

- Renamed several keymap actions for consistency (e.g., `GoToPrevHunk` →
`GoToPreviousHunk`, `TabPrev` → `Backtab`). Your existing configured
keybindings will still work. You can click **"Backup and Update"** at
the top of your keymap file to easily update to the new actions.


Co-authored-by: Joseph T. Lyons <JosephTLyons@gmail.com>

assets/keymaps/macos/atom.json

@@ -40,7 +40,7 @@
     "context": "BufferSearchBar",
     "bindings": {
       "cmd-f3": "search::SelectNextMatch",
-      "cmd-shift-f3": "search::SelectPrevMatch"
+      "cmd-shift-f3": "search::SelectPreviousMatch"
     }
   },
   {

assets/keymaps/macos/emacs.json

@@ -122,7 +122,7 @@
     "context": "BufferSearchBar > Editor",
     "bindings": {
       "ctrl-s": "search::SelectNextMatch",
-      "ctrl-r": "search::SelectPrevMatch",
+      "ctrl-r": "search::SelectPreviousMatch",
       "ctrl-g": "buffer_search::Dismiss"
     }
   },

assets/keymaps/macos/jetbrains.json

@@ -39,9 +39,9 @@
       "cmd-shift-b": "editor::GoToTypeDefinition",
       "cmd-alt-shift-b": "editor::GoToTypeDefinitionSplit",
       "f2": "editor::GoToDiagnostic",
-      "shift-f2": "editor::GoToPrevDiagnostic",
+      "shift-f2": "editor::GoToPreviousDiagnostic",
       "ctrl-alt-shift-down": ["editor::GoToHunk", { "center_cursor": true }],
-      "ctrl-alt-shift-up": ["editor::GoToPrevHunk", { "center_cursor": true }],
+      "ctrl-alt-shift-up": ["editor::GoToPreviousHunk", { "center_cursor": true }],
       "cmd-home": "editor::MoveToBeginning",
       "cmd-end": "editor::MoveToEnd",
       "cmd-shift-home": "editor::SelectToBeginning",
@@ -61,7 +61,7 @@
   {
     "context": "BufferSearchBar > Editor",
     "bindings": {
-      "shift-enter": "search::SelectPrevMatch"
+      "shift-enter": "search::SelectPreviousMatch"
     }
   },
   {

assets/keymaps/macos/sublime_text.json

@@ -45,7 +45,7 @@
       "ctrl-alt-cmd-down": "editor::GoToDefinitionSplit",
       "alt-shift-cmd-down": "editor::FindAllReferences",
       "ctrl-.": ["editor::GoToHunk", { "center_cursor": true }],
-      "ctrl-,": ["editor::GoToPrevHunk", { "center_cursor": true }],
+      "ctrl-,": ["editor::GoToPreviousHunk", { "center_cursor": true }],
       "cmd-k cmd-u": "editor::ConvertToUpperCase",
       "cmd-k cmd-l": "editor::ConvertToLowerCase",
       "cmd-shift-j": "editor::JoinLines",
@@ -64,7 +64,7 @@
     "context": "Pane",
     "bindings": {
       "f4": "search::SelectNextMatch",
-      "shift-f4": "search::SelectPrevMatch",
+      "shift-f4": "search::SelectPreviousMatch",
       "cmd-1": ["pane::ActivateItem", 0],
       "cmd-2": ["pane::ActivateItem", 1],
       "cmd-3": ["pane::ActivateItem", 2],

assets/keymaps/macos/textmate.json

@@ -47,7 +47,7 @@
     "context": "BufferSearchBar",
     "bindings": {
       "ctrl-s": "search::SelectNextMatch",
-      "ctrl-shift-s": "search::SelectPrevMatch"
+      "ctrl-shift-s": "search::SelectPreviousMatch"
     }
   },
   {