fix: Do not bring junit4 into all TestBench projects (#15752)

Use the same dependency as flow-components

Author: Artur-

flow-html-components-testbench/pom.xml

@@ -17,8 +17,9 @@
     <dependencies>
         <dependency>
             <groupId>com.vaadin</groupId>
-            <artifactId>vaadin-testbench-core</artifactId>
+            <artifactId>vaadin-testbench-shared</artifactId>
             <version>${testbench.version}</version>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>com.vaadin</groupId>