Revert back to pluginManagement and plugin

- Revert back to using the pluginManagement and the agent in the plugin
- Remove extra line feeds at closing tags
- Remove jacoco plugin version in the aggregateReport

pom.xml

@@ -93,20 +93,11 @@
   </repositories>
 
   <build>
-    <pluginManagement>
-      <plugins>
-        <plugin>
-          <groupId>org.jacoco</groupId>
-          <artifactId>jacoco-maven-plugin</artifactId>
-          <version>${jacoco-maven-plugin.version}</version>
-        </plugin>
-      </plugins>
-    </pluginManagement>
-
     <plugins>
       <plugin>
         <groupId>org.jacoco</groupId>
         <artifactId>jacoco-maven-plugin</artifactId>
+        <version>${jacoco-maven-plugin.version}</version>
         <executions>
           <execution>
             <id>prepare-agent</id>