chore: clean up and update renovate.json (#821)

To remove unused package groupings and add "test" commit type

Author: stephaniewang526

synthtool/gcp/templates/java_library/renovate.json

@@ -17,24 +17,6 @@
       ],
       "versionScheme": "docker"
     },
-    {
-      "packagePatterns": [
-        "^com.google.api:gax",
-        "^com.google.auth:",
-        "^com.google.cloud:google-cloud-core",
-        "^io.grpc:",
-        "^com.google.guava:"
-      ],
-      "groupName": "core dependencies"
-    },
-    {
-      "packagePatterns": [
-        "^com.google.http-client:",
-        "^com.google.oauth-client:",
-        "^com.google.api-client:"
-      ],
-      "groupName": "core transport dependencies"
-    },
     {
       "packagePatterns": [
         "*"
@@ -63,6 +45,16 @@
       "semanticCommitType": "chore",
       "semanticCommitScope": "deps"
     },
+    {
+      "packagePatterns": [
+        "^junit:junit",
+        "^com.google.truth:truth",
+        "^org.mockito:mockito-core",
+        "^org.objenesis:objenesis"
+      ],
+      "semanticCommitType": "test",
+      "semanticCommitScope": "deps"
+    },
     {
       "packagePatterns": [
         "^com.google.cloud:google-cloud-"
@@ -78,4 +70,4 @@
   ],
   "semanticCommits": true,
   "masterIssue": true
-}
+}