[Field trial] Update the testing config for AutofillCreditCardSigninPromo

testing/variations/fieldtrial_testing_config.json

Index: testing/variations/fieldtrial_testing_config.json
diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index c55fd64a11b57ea2a7ceadc7c18034c744e90981..3e035c35402df12ca4e3e424145e77ddbc0b27e1 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -84,6 +84,28 @@
             ]
         }
     ],
+    "AutofillCreditCardSigninPromo": [
+        {
+            "platforms": [
+                "android",
+                "chromeos",
+                "linux",
+                "mac",
+                "win"
+            ],
+            "experiments": [
+                {
+                    "name": "EnabledFive",
+                    "params": {
+                        "impression_limit": "5"
+                    },
+                    "enable_features": [
+                        "AutofillCreditCardSigninPromo"
+                    ]
+                }
+            ]
+        }
+    ],
     "AutofillFieldMetadata": [
         {
             "platforms": [