fix(datahub-client): adds missing archiveAppendix to artifactid when publishing

[sgomezvillamor]

tested locally with publishMavenLocal

$ ./gradlew :metadata-integration:java:datahub-client:publishToMavenLocal 
...
$ ls $HOME/.m2/repository/io/acryl/datahub-client/*      
/Users/sergio/.m2/repository/io/acryl/datahub-client/maven-metadata-local.xml

/Users/sergio/.m2/repository/io/acryl/datahub-client/0.15.0rc3-SNAPSHOT:
datahub-client-0.15.0rc3-SNAPSHOT-javadoc.jar datahub-client-0.15.0rc3-SNAPSHOT-sources.jar datahub-client-0.15.0rc3-SNAPSHOT.jar         datahub-client-0.15.0rc3-SNAPSHOT.pom         maven-metadata-local.xml
$

and

$ ./gradlew clean :metadata-integration:java:datahub-client:publishToMavenLocal -PjavaClassVersionDefault=8 -ParchiveAppen         
$ ls $HOME/.m2/repository/io/acryl/datahub-client-java8/*                                                                          
/Users/sergio/.m2/repository/io/acryl/datahub-client-java8/maven-metadata-local.xml

/Users/sergio/.m2/repository/io/acryl/datahub-client-java8/0.15.0rc3-SNAPSHOT:
datahub-client-java8-0.15.0rc3-SNAPSHOT-javadoc.jar datahub-client-java8-0.15.0rc3-SNAPSHOT-sources.jar datahub-client-java8-0.15.0rc3-SNAPSHOT.jar         datahub-client-java8-0.15.0rc3-SNAPSHOT.pom         maven-metadata-local.xml
$

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub