Build: Add back setting artifact id of pom for rest high level client (#32731)

This commit adds back the publishing section that sets the artifact id
of the generated pom file for the high level rest client. This was
accidentally removed during a consolidationo of the shadow plugin logic.

client/rest-high-level/build.gradle

@@ -30,6 +30,14 @@ apply plugin: 'com.github.johnrengelman.shadow'
 group = 'org.elasticsearch.client'
 archivesBaseName = 'elasticsearch-rest-high-level-client'
 
+publishing {
+  publications {
+    nebula {
+      artifactId = archivesBaseName
+    }
+  }
+}
+
 //we need to copy the yaml spec so we can check naming (see RestHighlevelClientTests#testApiNamingConventions)
 Task copyRestSpec = RestIntegTestTask.createCopyRestSpecTask(project, Providers.FALSE)
 test.dependsOn(copyRestSpec)