Add ChromeOSKstaled to field trial

This is required to move the experiment to beta.
Also ran script to fix formatting.

BUG: 1039469
TEST: presubmit passed
Change-Id: I35dbd7528217e92d34b120f97637be5c8b0f7cd2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015775Reviewed-by: Brian Geffon <bgeffon@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Sonny Rao <sonnyrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737147}

testing/variations/fieldtrial_testing_config.json

@@ -1481,6 +1481,33 @@
             ]
         }
     ],
+    "ChromeOSKstaled": [
+        {
+            "platforms": [
+                "chromeos"
+            ],
+            "experiments": [
+                {
+                    "name": "EnabledRatio4",
+                    "params": {
+                        "KstaledRatio": "4"
+                    },
+                    "enable_features": [
+                        "KstaledSwap"
+                    ]
+                },
+                {
+                    "name": "EnabledRatio6",
+                    "params": {
+                        "KstaledRatio": "6"
+                    },
+                    "enable_features": [
+                        "KstaledSwap"
+                    ]
+                }
+            ]
+        }
+    ],
     "ChromeOSLauncherAssistantIntegration": [
         {
             "platforms": [