chore(ci): Feature branch should be checked against CURRENT_BRANCH

The feature build is getting confused in certain situations, possibly
having to do with multiple merge commits from upgrades and pulling
changes from master.

Ref: LOG-18882

Jenkinsfile

@@ -151,7 +151,9 @@ pipeline {
     }
     stage('Feature build and publish') {
       when {
-        branch pattern: "(feature\\/LOG-\\d+)", comparator: "REGEXP"
+        expression {
+          CURRENT_BRANCH ==~ /feature\/LOG-\d+/
+        }
       }
       steps {
         script {