remove keystore

Author: mpeddada1

.kokoro/presubmit/common.cfg

@@ -23,12 +23,3 @@ env_vars: {
   key: "JOB_TYPE"
   value: "test"
 }
-
-before_action {
-  fetch_keystore {
-    keystore_resource {
-      keystore_config_id: 73713
-      keyname: "dpebot_codecov_token"
-    }
-  }
-}