DTSPO-13810 reschedule nightlybuilds to start at 8am (#573)

Jenkinsfile_nightly

@@ -2,7 +2,7 @@
 
 properties([
   // H allow predefined but random minute see https://en.wikipedia.org/wiki/Cron#Non-standard_characters
-  pipelineTriggers([cron('H 07 * * 1-5')]),
+  pipelineTriggers([cron('H 8 * * 1-5')]),
   parameters([
     string(name: 'URL_TO_TEST', defaultValue: 'http://wa-case-event-handler-aat.service.core-compute-aat.internal', description: 'The URL you want to run these tests against'),
     string(name: 'SecurityRules',