[EG] MadeRequired file separated

[l0lawrence]

It can be made into a csharp only client.tsp file or we can add it to the client.tsp file. I made it just for csharp rn so the 2018 swagger is generating like the 2024 version

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[openapi-pipeline-app]

Generated ApiView

Language	Package Name	ApiView Link
.Net	Azure.Messaging.EventGrid.SystemEvents	https://apiview.dev/Assemblies/Review/3e102a891e5445af8be8cde833dbb702?revisionId=d453be6eb36b49098f8ceedeed78cc6a
Python	azure-eventgrid	https://apiview.dev/Assemblies/Review/c554ddbabc6e40348998b1656e0ff585?revisionId=f09c3796d74e49ad9b30cc39fc4e9837
TypeSpec	Azure.Messaging.EventGrid.SystemEvents	Create ApiView failed. To get help, please see [aka.ms/azsdk/pr-getting-help](https://aka.ms/azsdk/pr-getting-help).

[azure-sdk]

API change check

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