fix(ci): Get semver tag during Publish stage

Re-add the call to `semver` in the Publish stage. This gets the tag for
releasing. Previous merge conflict resolution  somehow erased this code.

Ref: LOG-19889

Jenkinsfile

@@ -218,6 +218,8 @@ pipeline {
       }
       steps {
         script {
+          def semver = npm.semver() // get the tag
+
           buildx.build(
             project: PROJECT_NAME
           , push: true