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>

crates/git_ui/src/git_panel.rs

@@ -21,7 +21,7 @@ use git::{RestoreTrackedFiles, StageAll, TrashUntrackedFiles, UnstageAll};
 use gpui::*;
 use itertools::Itertools;
 use language::{Buffer, File};
-use menu::{Confirm, SecondaryConfirm, SelectFirst, SelectLast, SelectNext, SelectPrev};
+use menu::{Confirm, SecondaryConfirm, SelectFirst, SelectLast, SelectNext, SelectPrevious};
 use multi_buffer::ExcerptInfo;
 use panel::{
     panel_editor_container, panel_editor_style, panel_filled_button, panel_icon_button, PanelHeader,
@@ -581,7 +581,12 @@ impl GitPanel {
         }
     }
 
-    fn select_prev(&mut self, _: &SelectPrev, _window: &mut Window, cx: &mut Context<Self>) {
+    fn select_previous(
+        &mut self,
+        _: &SelectPrevious,
+        _window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
         let item_count = self.entries.len();
         if item_count == 0 {
             return;
@@ -2596,7 +2601,7 @@ impl Render for GitPanel {
             })
             .on_action(cx.listener(Self::select_first))
             .on_action(cx.listener(Self::select_next))
-            .on_action(cx.listener(Self::select_prev))
+            .on_action(cx.listener(Self::select_previous))
             .on_action(cx.listener(Self::select_last))
             .on_action(cx.listener(Self::close_panel))
             .on_action(cx.listener(Self::open_diff))

crates/git_ui/src/project_diff.rs

@@ -3,7 +3,7 @@ use anyhow::Result;
 use buffer_diff::{BufferDiff, DiffHunkSecondaryStatus};
 use collections::HashSet;
 use editor::{
-    actions::{GoToHunk, GoToPrevHunk},
+    actions::{GoToHunk, GoToPreviousHunk},
     scroll::Autoscroll,
     Editor, EditorEvent, ToPoint,
 };
@@ -869,7 +869,7 @@ impl Render for ProjectDiffToolbar {
                             .shape(ui::IconButtonShape::Square)
                             .tooltip(Tooltip::for_action_title_in(
                                 "Go to previous hunk",
-                                &GoToPrevHunk {
+                                &GoToPreviousHunk {
                                     center_cursor: false,
                                 },
                                 &focus_handle,
@@ -877,7 +877,7 @@ impl Render for ProjectDiffToolbar {
                             .disabled(!button_states.prev_next)
                             .on_click(cx.listener(|this, _, window, cx| {
                                 this.dispatch_action(
-                                    &GoToPrevHunk {
+                                    &GoToPreviousHunk {
                                         center_cursor: true,
                                     },
                                     window,