Add Cmd/Ctrl+R keybinding to refresh PR overview in editor (#8292)

* Initial plan

* Initial plan for Command R refresh feature

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

* Add Command R keybinding to refresh PR overview in editor

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

Author: Copilot

package.json

@@ -2050,6 +2050,12 @@
 				"mac": "cmd+k m",
 				"command": "pr.makeSuggestion",
 				"when": "commentEditorFocused"
+			},
+			{
+				"key": "ctrl+r",
+				"mac": "cmd+r",
+				"command": "pr.refreshDescription",
+				"when": "activeWebviewPanelId == 'PullRequestOverview'"
 			}
 		],
 		"menus": {