chore: centralize native image configs

Author: diegomarquezp

google-cloud-bigtable-emulator/pom.xml

@@ -120,6 +120,12 @@
       <groupId>com.google.api</groupId>
       <artifactId>gax-grpc</artifactId>
     </dependency>
+    <dependency>
+      <groupId>com.google.api</groupId>
+      <artifactId>gax</artifactId>
+      <classifier>testlib</classifier>
+      <scope>test</scope>
+    </dependency>
 
     <dependency>
       <groupId>junit</groupId>