chore: remove distributionManagement section (#899)

All java client libraries inherit the distributionManagement section form shared-config. To prevent individual pom files from overriding the shared-config version of distributionManagement, it is being removed.

Author: Neenu1995

pom.xml

@@ -129,16 +129,7 @@
         <url>https://github.com/googleapis/java-bigtable/issues</url>
         <system>GitHub Issues</system>
     </issueManagement>
-    <distributionManagement>
-        <snapshotRepository>
-            <id>sonatype-nexus-snapshots</id>
-            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
-        </snapshotRepository>
-        <repository>
-            <id>sonatype-nexus-staging</id>
-            <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
-        </repository>
-    </distributionManagement>
+    
     <licenses>
         <license>
             <name>Apache-2.0</name>