🐛 Fix broken Mango Sandstorm rule

[pemontto]

This rule was all kinds of broken

Change(s):

• Add ActorUsername for tables where it doesn't exist
• Fixed the mixed case of DvcHostname and ProcessId breaking entities, preferring lowercase style as per https://learn.microsoft.com/azure/sentinel/normalization-schema-process-event
• Fixed redundant and broken ProcessID assignment outside the union. Also cast all ProcessId fields to string so the entity doesn't break.
• Fix the non-existent UPNSuffix entity, using NTDomain instead

Reason for Change(s):

• So the rule can deploy and work correctly

Version Updated: ✅

Testing Completed: ✅

[v-prasadboke]

Please repackage the Solution using V3