[SIEM] Cypress screenshots upload to google cloud (#60556)

* testing screenshots upload to google cloud

* testing another pattern

* fixes artifact pattern

* uploads only the .png files

* only limit uploads from kibana-siem directory

Co-authored-by: spalger <spalger@users.noreply.github.com>

vars/kibanaPipeline.groovy

@@ -98,6 +98,7 @@ def withGcsArtifactUpload(workerName, closure) {
   def uploadPrefix = "kibana-ci-artifacts/jobs/${env.JOB_NAME}/${BUILD_NUMBER}/${workerName}"
   def ARTIFACT_PATTERNS = [
     'target/kibana-*',
+    'target/kibana-siem/**/*.png',
     'target/junit/**/*',
     'test/**/screenshots/**/*.png',
     'test/functional/failure_debug/html/*.html',