Delete cron.xml (#1965)

We've successfully migrated to using Cloud Scheduler.

core/src/main/java/google/registry/env/alpha/default/WEB-INF/cron.xml

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--TODO: ptkach - Remove this file after cloud scheduler is fully up and running -->
-<cronentries>
-
-</cronentries>

core/src/main/java/google/registry/env/crash/default/WEB-INF/cron.xml

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--TODO: ptkach - Remove this file after cloud scheduler is fully up and running -->
-<cronentries>
-
-</cronentries>

core/src/main/java/google/registry/env/production/default/WEB-INF/cron.xml

@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--TODO: ptkach - Remove this file after cloud scheduler is fully up and running -->
-<cronentries>
-</cronentries>

core/src/main/java/google/registry/env/qa/default/WEB-INF/cron.xml

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--TODO: ptkach - Remove this file after cloud scheduler is fully up and running -->
-<cronentries>
-
-</cronentries>

core/src/main/java/google/registry/env/sandbox/default/WEB-INF/cloud-scheduler-tasks.xml

@@ -11,9 +11,6 @@
     <!--
       This only needs to run once per day, but we launch additional jobs in case the
       cursor is lagging behind, so it'll catch up to the current date eventually.
-
-      See <a href="../../../production/default/WEB-INF/cron.xml">production config</a> for an
-      explanation of job starting times.
     -->
     <schedule>7 */12 * * *</schedule>
   </task>

release/cloudbuild-deploy.yaml

@@ -59,7 +59,7 @@ steps:
     else
       project_id="domain-registry-${_ENV}"
     fi
-    for filename in cron dispatch queue; do
+    for filename in dispatch queue; do
       gcloud -q --project $project_id app deploy \
         default/WEB-INF/appengine-generated/$filename.yaml
     done