## Added new field - execution type for alerts

Added new field only for security type alerts:

`kibana.alert.rule.execution.type` - can be `manual` or `scheduled`

Also, move intended timestamp settings from
`create_persistence_rule_type_wrapper` to `build_alert`

Also added those new field to Alert schema and types.

https://github.com/user-attachments/assets/c5b021a6-4763-47ae-b46c-814a138be65a

For tests:

- tests all rule types with and without suppression:
`kibana.alert.rule.execution.type` - should be `scheduled`,
`kibana.alert.intended_timestamp` - should equal alert timestamp

- tests all rules with and without suppression with manual run -
`kibana.alert.rule.execution.type` - should be `manual`,
`kibana.alert.intended_timestamp` - should equal date inside you manual
rule run date range

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Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
(cherry picked from commit 3d466a7)