Help: Add build and test preset to examples in cmake-presets(7)

Co-Author: Brad King <brad.king@kitware.com>

Help/manual/presets/example.json

 {
-  "version": 1,
+  "version": 2,
   "cmakeMinimumRequired": {
     "major": 3,
-    "minor": 19,
+    "minor": 20,
     "patch": 0
   },
   "configurePresets": [
@@ -37,6 +37,20 @@
       "generator": "Ninja Multi-Config"
     }
   ],
+  "buildPresets": [
+    {
+      "name": "default",
+      "configurePreset": "default"
+    }
+  ],
+  "testPresets": [
+    {
+      "name": "default",
+      "configurePreset": "default",
+      "output": {"outputOnFailure": true},
+      "execution": {"noTestsAction": "error", "stopOnFailure": true}
+    }
+  ],
   "vendor": {
     "example.com/ExampleIDE/1.0": {
       "autoFormat": false