OZG-4786 Refactored check for release Branch in Jenkinsfile

Jenkinsfile

@@ -277,7 +277,7 @@ String generateHelmChartVersion() {
     if (isMasterBranch()) {
         chartVersion += "-${env.GIT_COMMIT.take(7)}"
     }
-    else if (env.BRANCH_NAME != 'release') {
+    else if (!isReleaseBranch()) {
         chartVersion += "-${env.BRANCH_NAME}"
     }