Expand timestamp override tests (#1907)

* Expand timestamp_override tests
* removed timestamp_override from eql sequence rules
* add config entry for eql rules with beats index and t_o
* add timestamp_override to missing fields

rules/windows/execution_com_object_xwizard.toml

@@ -1,7 +1,7 @@
 [metadata]
 creation_date = "2021/01/20"
 maturity = "production"
-updated_date = "2021/03/03"
+updated_date = "2022/03/31"
 
 [rule]
 author = ["Elastic"]
@@ -15,6 +15,10 @@ index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
 language = "eql"
 license = "Elastic License v2"
 name = "Execution of COM object via Xwizard"
+note = """## Config
+
+If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
+"""
 references = [
     "https://lolbas-project.github.io/lolbas/Binaries/Xwizard/",
     "http://www.hexacorn.com/blog/2017/07/31/the-wizard-of-x-oppa-plugx-style/",