HDDS-14690. Remove unused maven-war-plugin from root POM (#9804)

Author: adoroszlai

pom.xml

@@ -160,7 +160,6 @@
     <maven-surefire-plugin.argLineAccessArgs />
     <maven-surefire-plugin.version>3.5.2</maven-surefire-plugin.version>
     <maven-surefire-report-plugin.version>${maven-surefire-plugin.version}</maven-surefire-report-plugin.version>
-    <maven-war-plugin.version>3.4.0</maven-war-plugin.version>
     <maven.compiler.createMissingPackageInfoClass>false</maven.compiler.createMissingPackageInfoClass>
     <maven.compiler.release>8</maven.compiler.release>
     <maven.core.version>3.9.12</maven.core.version>
@@ -1762,11 +1761,6 @@
             <notimestamp>true</notimestamp>
           </configuration>
         </plugin>
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-war-plugin</artifactId>
-          <version>${maven-war-plugin.version}</version>
-        </plugin>
         <plugin>
           <groupId>com.github.spotbugs</groupId>
           <artifactId>spotbugs-maven-plugin</artifactId>