Refactor resource events and associate them to work item

What does this MR do and why?

This MR improved the ResourceEvent models to allow for building the Synthetic notes from the event for the work item. We need to be able to build these notes on event creation callback so that we would push this data to graphql subscriptions

This MR is extracted as smaller piece of a bigger POC MR !106284 (closed)

related issue #385468 (closed)

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