Add short title to execSelectionInTerminal command in command palette

Fixes #22008

Adds shortTitle to the python.execSelectionInTerminal command registration
in the command palette menu, matching the shortTitle already present in
the main command contribution.

Author: Jah-yee

package.json

@@ -1324,6 +1324,7 @@
                     "category": "Python",
                     "command": "python.execSelectionInTerminal",
                     "title": "%python.command.python.execSelectionInTerminal.title%",
+                    "shortTitle": "%python.command.python.execSelectionInTerminal.shortTitle%",
                     "when": "!virtualWorkspace && shellExecutionSupported && editorLangId == python"
                 },
                 {