[Fix] Start running workload-server-distribution tests (#6748)

Author: mdaudali

atlasdb-workload-server-distribution/build.gradle

@@ -1,6 +1,7 @@
 apply plugin: 'com.palantir.sls-java-service-distribution'
 apply plugin: 'com.palantir.external-publish-dist'
 apply from: "../gradle/shared.gradle"
+apply from: "../gradle/tests.gradle"
 apply from: "../gradle/docker.gradle"
 apply from: "../gradle/non-client-dist.gradle"
 
@@ -39,4 +40,4 @@ distribution {
     mainClass 'com.palantir.atlasdb.workload.WorkloadServerLauncher'
     args 'server', 'var/conf/workload-server.yml'
     defaultJvmOpts "-Xms512m", "-Xmx512m"
-}
+}