[FLINK-16834] Add flink-clients to flink-quickstarts poms

Flink quickstarts' poms need to include flink-clients as a dependency because it is
no longer transitively pulled into the project.

flink-quickstart/flink-quickstart-java/src/main/resources/archetype-resources/pom.xml

@@ -66,6 +66,12 @@ under the License.
 			<version>${flink.version}</version>
 			<scope>provided</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.apache.flink</groupId>
+			<artifactId>flink-clients_${scala.binary.version}</artifactId>
+			<version>${flink.version}</version>
+			<scope>provided</scope>
+		</dependency>
 
 		<!-- Add connector dependencies here. They must be in the default scope (compile). -->
 

flink-quickstart/flink-quickstart-scala/src/main/resources/archetype-resources/pom.xml

@@ -65,6 +65,12 @@ under the License.
 			<version>${flink.version}</version>
 			<scope>provided</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.apache.flink</groupId>
+			<artifactId>flink-clients_${scala.binary.version}</artifactId>
+			<version>${flink.version}</version>
+			<scope>provided</scope>
+		</dependency>
 
 		<!-- Scala Library, provided by Flink as well. -->
 		<dependency>