[monorepo] try harder at timing out Jenkins builds (#27897)

GitOrigin-RevId: 9d9b675d4603da761b725ab0470ecc7af4141ef0

server-ce/test/Jenkinsfile

@@ -16,6 +16,7 @@ pipeline {
   options {
     timestamps()
     parallelsAlwaysFailFast()
+    timeout(time: 15, unit: 'MINUTES')
   }
 
   environment {

services/web/Jenkinsfile

@@ -21,6 +21,7 @@ pipeline {
   options {
     timestamps()
     parallelsAlwaysFailFast()
+    timeout(time: 15, unit: 'MINUTES')
   }
 
   environment {