Hide some recently added commands from command palette (#7694)

They shouldn't be shown in the command palette as they are intended to be used exclusively from other menus.

Author: alexr00

package.json

@@ -2057,6 +2057,14 @@
 					"command": "pr.checkoutFromDescription",
 					"when": "false"
 				},
+				{
+					"command": "pr.applyChangesFromDescription",
+					"when": "false"
+				},
+				{
+					"command": "pr.checkoutChatSessionPullRequest",
+					"when": "false"
+				},
 				{
 					"command": "pr.checkoutOnVscodeDevFromDescription",
 					"when": "false"