Werk #15654: windows_tasks: allow discovery to decide if disabled tasks are included or not

The Windows Tasks rule allowed the user to map 'not enabled' tasks to a specific state. This rule also allowed to target tasks which switched from an 'enabled' to a 'disabled' state between check cycles. However, tasks which were 'disabled' during discovery were previously filtered out and could therefore not benefit from this rule.

This led to confusion as to what group was targeted by the specification 'not enabled'. This werk, therefore, introduces an appropriate discovery rule which allows the user to control whether 'disabled' tasks, at the point of discovery, are supposed to be monitored or not.

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