Updat the Entity eum to include all the new types

[pkhabazi]

Looks like there are quite a few more entities coming as well - https://github.com/Azure/Azure-Sentinel/blob/9f0fa91b9045d80a01032aa0e164ea701a02f77d/.script/tests/detectionTemplateStructureValidation/Models/EntityType.cs

public enum EntityType
    {
        Account,
        Host,
        IP,
        Malware,
        File,
        Process,
        CloudApplication,
        DNS,
        AzureResource,
        FileHash,
        RegistryKey,
        RegistryValue,
        SecurityGroup,
        URL,
        IoTDevice,
        Mailbox,
        MailCluster,
        MailMessage,
        SubmissionMail
    }