Delete obsolete manual system event swaggers #38235
Description
Everything under azure-rest-api-specs/specification/eventgrid/data-plane at main · Azure/azure-rest-api-specs can be deleted except for Microsoft.EventGrid. Under that directory we could delete azure-rest-api-specs/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2018-01-01/Syste… and the examples only.
The GeneratedSystemEvents.json swagger should be retained as well as all swaggers that describe rest operations.