Followup changes for instance level event filter model creation

Hitesh Raghuvanshi requested to merge 411524-event-filter-migration into master
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What does this MR do and why?

Migration and model for InstanceEventTypeFilter which represents audit event type filters for instance level external audit event destinations were added in !123330 (merged). This is a follow up MR to that and adds additional code changes around the models in this MR in relation to the external destinations.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #416450 (closed)

Edited by Hitesh Raghuvanshi

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