Using jenkins env var instead of extracting function

scripts/build/Jenkins/Jenkinsfile

@@ -349,18 +349,6 @@ def Build(Map options, String platform, String type, String workspace) {
     }
 }
 
-def getJenkinsBaseUrl() {
-    def job_url = new URL(env.JOB_URL)
-
-    // Return a new URL using the protocol, host and port only.
-    return new URL(
-        job_url.getProtocol(),
-        job_url.getHost(),
-        job_url.getPort(),
-        ''
-    ).toString()
-}
-
 def TestMetrics(Map options, String workspace, String branchName, String repoName, String buildJobName, String outputDirectory, String configuration) {
     catchError(buildResult: null, stageResult: null) {
         def cmakeBuildDir = [workspace, ENGINE_REPOSITORY_NAME, outputDirectory].join('/')
@@ -372,10 +360,9 @@ def TestMetrics(Map options, String workspace, String branchName, String repoNam
                 userRemoteConfigs: [[url: "${env.MARS_REPO}", name: 'mars', credentialsId: "${env.GITHUB_USER}"]]
             ]
             withCredentials([usernamePassword(credentialsId: "${env.SERVICE_USER}", passwordVariable: 'apitoken', usernameVariable: 'username')]) {
-                def jenkins_url = getJenkinsBaseUrl()
                 def command = "${options.PYTHON_DIR}/python.cmd -u mars/scripts/python/ctest_test_metric_scraper.py" +
                               "-e jenkins.creds.user ${username} -e jenkins.creds.pass ${apitoken} " +
-                              "-e jenkins.base_url ${jenkins_url}" +
+                              "-e jenkins.base_url ${env.JENKINS_URL}" +
                               "${cmakeBuildDir} ${branchName} %BUILD_NUMBER% AR ${configuration} ${repoName} "
                 bat label: "Publishing ${buildJobName} Test Metrics",
                     script: command