test(cypress): Do not run cron in ajax mode

This prevent random slowdown during tests, making them more reliable, and faster.

Signed-off-by: Louis Chemineau <louis@chmn.me>

cypress/dockerNode.ts

 	await runExec(container, ['php', 'occ', 'config:system:set', 'default_locale', '--value', 'en_US'], true)
 	await runExec(container, ['php', 'occ', 'config:system:set', 'force_locale', '--value', 'en_US'], true)
 	await runExec(container, ['php', 'occ', 'config:system:set', 'enforce_theme', '--value', 'light'], true)
+	// Speed up test and make them less flaky. If a cron execution is needed, it can be triggered manually.
+	await runExec(container, ['php', 'occ', 'background:cron'], true)
 
 	console.log('└─ Nextcloud is now ready to use 🎉')
 }