Fix maven build warnings

[madurangasiriwardena]

Below warning logs are fixed

[WARNING] Some problems were encountered while building the effective model for org.wso2.is:api-resources-full:war:7.1.0-m5-SNAPSHOT
[WARNING] 'dependencyManagement.dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: org.wso2.carbon.consent.mgt:org.wso2.carbon.api.server.consent.mgt:jar -> duplicate declaration of version ${carbon.consent.mgt.version} @ org.wso2.is:api-resources:7.1.0-m5-SNAPSHOT, /Users/maduranga/Documents/wso2/git/product-is/modules/api-resources/pom.xml, line 560, column 25
[WARNING]
[WARNING] Some problems were encountered while building the effective model for org.wso2.is:api-resources:pom:7.1.0-m5-SNAPSHOT
[WARNING] 'dependencyManagement.dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: org.wso2.carbon.consent.mgt:org.wso2.carbon.api.server.consent.mgt:jar -> duplicate declaration of version ${carbon.consent.mgt.version} @ line 560, column 25
[WARNING]
[WARNING] Some problems were encountered while building the effective model for org.wso2.is:wso2is:jar:7.1.0-m5-SNAPSHOT
[WARNING] 'build.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin com.google.code.maven-config-processor-plugin:config-processor-maven-plugin @ line 643, column 21
[WARNING] Reporting configuration should be done in <reporting> section, not in maven-site-plugin <configuration> as reportPlugins parameter. @ line 586, column 32