remove duplicated artifacts in bigtable pom file (#3584)

Author: yihanzhen

google-cloud-clients/google-cloud-bigtable/pom.xml

@@ -30,20 +30,10 @@
       <groupId>com.google.api.grpc</groupId>
       <artifactId>proto-google-cloud-bigtable-v2</artifactId>
     </dependency>
-    <dependency>
-      <groupId>com.google.api.grpc</groupId>
-      <artifactId>grpc-google-cloud-bigtable-v2</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>proto-google-cloud-bigtable-admin-v2</artifactId>
     </dependency>
-    <dependency>
-      <groupId>com.google.api.grpc</groupId>
-      <artifactId>grpc-google-cloud-bigtable-admin-v2</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-netty-shaded</artifactId>
@@ -70,6 +60,11 @@
       <type>test-jar</type>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.google.api.grpc</groupId>
+      <artifactId>grpc-google-cloud-bigtable-v2</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>grpc-google-cloud-bigtable-admin-v2</artifactId>