Fixes #27730: Deprecation warnings in our package.json

.vscode/tasks.json

@@ -30,7 +30,7 @@
 					"location": 2,
 					"message": 3
 				},
-				"watching": {
+				"background": {
 					"beginsPattern": "Starting compilation",
 					"endsPattern": "Finished compilation"
 				}

extensions/typescript/package.json

@@ -479,7 +479,7 @@
           "${cwd}"
         ],
         "pattern": "$tsc",
-        "watching": {
+        "background": {
           "activeOnStart": true,
           "beginsPattern": {
             "regexp": "^\\s*(?:message TS6032:|\\d{1,2}:\\d{1,2}:\\d{1,2}(?: AM| PM)? -) File change detected\\. Starting incremental compilation\\.\\.\\."