Run expconfigfetcher only when user has proper auth

It is useless to run this binary when gcert creds aren't available, so
adding a check for gcert creds before calling this binary. Also modified
metrics to capture missing gcert.

Bug: b/237938234
Change-Id: I94b5aa2d53c4e5bb1a5fdc913a33ef5bae965d32
diff --git a/ui/metrics/metrics_proto/metrics.pb.go b/ui/metrics/metrics_proto/metrics.pb.go
index 4bc713b..2dd8299 100644
--- a/ui/metrics/metrics_proto/metrics.pb.go
+++ b/ui/metrics/metrics_proto/metrics.pb.go
@@ -220,9 +220,10 @@
 type ExpConfigFetcher_ConfigStatus int32
 
 const (
-	ExpConfigFetcher_NO_CONFIG ExpConfigFetcher_ConfigStatus = 0
-	ExpConfigFetcher_CONFIG    ExpConfigFetcher_ConfigStatus = 1
-	ExpConfigFetcher_ERROR     ExpConfigFetcher_ConfigStatus = 2
+	ExpConfigFetcher_NO_CONFIG     ExpConfigFetcher_ConfigStatus = 0
+	ExpConfigFetcher_CONFIG        ExpConfigFetcher_ConfigStatus = 1
+	ExpConfigFetcher_ERROR         ExpConfigFetcher_ConfigStatus = 2
+	ExpConfigFetcher_MISSING_GCERT ExpConfigFetcher_ConfigStatus = 3
 )
 
 // Enum value maps for ExpConfigFetcher_ConfigStatus.
@@ -231,11 +232,13 @@
 		0: "NO_CONFIG",
 		1: "CONFIG",
 		2: "ERROR",
+		3: "MISSING_GCERT",
 	}
 	ExpConfigFetcher_ConfigStatus_value = map[string]int32{
-		"NO_CONFIG": 0,
-		"CONFIG":    1,
-		"ERROR":     2,
+		"NO_CONFIG":     0,
+		"CONFIG":        1,
+		"ERROR":         2,
+		"MISSING_GCERT": 3,
 	}
 )
 
@@ -1578,7 +1581,7 @@
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@@ -1587,22 +1590,23 @@
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 }
 
 var (
diff --git a/ui/metrics/metrics_proto/metrics.proto b/ui/metrics/metrics_proto/metrics.proto
index 51dd523..4f8fe7f 100644
--- a/ui/metrics/metrics_proto/metrics.proto
+++ b/ui/metrics/metrics_proto/metrics.proto
@@ -251,6 +251,7 @@
     NO_CONFIG = 0;
     CONFIG = 1;
     ERROR = 2;
+    MISSING_GCERT = 3;
   }
   // The result of the call to expconfigfetcher
   // NO_CONFIG - Not part of experiment