jobs/build-node-image: move emoji to start of message to match other jobs

The build status emoji (e.g. ✨, 🔥) is currently at the end of the
slack message. Move it to appear at the beginning of the message to
match format used by the other jobs.

Also hard code the Jenkins build description emojis since the Slack
emojis (e.g. ✨) don't render properly in Jenkins.

Author: marmijo

jobs/build-node-image.Jenkinsfile

@@ -174,12 +174,15 @@ lock(resource: "build-node-image") {
         currentBuild.result = 'FAILURE'
         throw e
     } finally {
+        message = ":openshift:"
         if (currentBuild.result == 'SUCCESS') {
-            currentBuild.description = ":sparkles: ${build_description}"
+            currentBuild.description = "${build_description} ⚡"
+            message = "${message} :sparkles:"
         } else {
-            currentBuild.description = ":fire: ${build_description}"
+            currentBuild.description = "${build_description} ❌"
+            message = "${message} :fire:"
         }
-        message = ":openshift: build-node-image #${env.BUILD_NUMBER} <${env.BUILD_URL}|:jenkins:> <${env.RUN_DISPLAY_URL}|:ocean:> ${currentBuild.description}"
+        message = "${message} build-node-image #${env.BUILD_NUMBER} <${env.BUILD_URL}|:jenkins:> <${env.RUN_DISPLAY_URL}|:ocean:> ${build_description}"
         pipeutils.trySlackSend(message: message)
     }
 }}} // cosaPod, timeout, and lock finish here