[securitySolution/cypress] temporarily limit to PRs

(cherry picked from commit 1c5dc63)

Author: spalger

vars/tasks.groovy

@@ -115,14 +115,16 @@ def functionalXpack(Map params = [:]) {
       task(kibanaPipeline.functionalTestProcess('xpack-savedObjectsFieldMetrics', './test/scripts/jenkins_xpack_saved_objects_field_metrics.sh'))
     }
 
-     whenChanged([
-       'x-pack/plugins/security_solution/',
-       'x-pack/test/security_solution_cypress/',
-       'x-pack/plugins/triggers_actions_ui/public/application/sections/action_connector_form/',
-       'x-pack/plugins/triggers_actions_ui/public/application/context/actions_connectors_context.tsx',
-     ]) {
-       task(kibanaPipeline.functionalTestProcess('xpack-securitySolutionCypress', './test/scripts/jenkins_security_solution_cypress.sh'))
-     }
+    whenChanged([
+      'x-pack/plugins/security_solution/',
+      'x-pack/test/security_solution_cypress/',
+      'x-pack/plugins/triggers_actions_ui/public/application/sections/action_connector_form/',
+      'x-pack/plugins/triggers_actions_ui/public/application/context/actions_connectors_context.tsx',
+    ]) {
+      if (githubPr.isPr()) {
+        task(kibanaPipeline.functionalTestProcess('xpack-securitySolutionCypress', './test/scripts/jenkins_security_solution_cypress.sh'))
+      }
+    }
   }
 }