test: ignore command-staged-with-config flaky test output (#1047)

Author: fengmk2

packages/cli/snap-tests-global/command-staged-with-config/snap.txt

@@ -21,5 +21,4 @@
 
 > git add -A && git commit -m 'second'
 > printf 'eval("code");\n' > src/fail.js && git add src/fail.js
-[1]> vp staged # should fail when staged .js file has lint errors
-[STARTED] Backing up original state...
+[1]> vp staged > /dev/null 2>&1 # should fail when staged .js file has lint errors

packages/cli/snap-tests-global/command-staged-with-config/steps.json

@@ -1,4 +1,5 @@
 {
+  "ignoredPlatforms": ["win32"],
   "commands": [
     { "command": "git init", "ignoreOutput": true },
     { "command": "git add -A && git commit -m 'init'", "ignoreOutput": true },
@@ -12,6 +13,9 @@
       "command": "printf 'eval(\"code\");\\n' > src/fail.js && git add src/fail.js",
       "ignoreOutput": true
     },
-    "vp staged # should fail when staged .js file has lint errors"
+    {
+      "command": "vp staged > /dev/null 2>&1 # should fail when staged .js file has lint errors",
+      "ignoreOutput": true
+    }
   ]
 }