Delete obsolete manual system event swaggers from EventGrid data-plane

[Copilot]

Summary

This PR removes obsolete manual system event swagger specifications from the EventGrid data-plane directory as requested in the issue. The manual swaggers have been superseded by TypeSpec-generated specifications.

Changes Made

Deleted Services (24 directories)

Removed all Microsoft.* service directories from specification/eventgrid/data-plane/ except for Microsoft.EventGrid:

• Microsoft.AVS, Microsoft.ApiCenter, Microsoft.ApiManagement, Microsoft.AppConfiguration
• Microsoft.Cache, Microsoft.Communication, Microsoft.ContainerRegistry, Microsoft.ContainerService
• Microsoft.DataBox, Microsoft.Devices, Microsoft.Edge, Microsoft.EventHub
• Microsoft.HealthcareApis, Microsoft.KeyVault, Microsoft.MachineLearningServices, Microsoft.Maps
• Microsoft.Media, Microsoft.PolicyInsights, Microsoft.ResourceNotifications, Microsoft.Resources
• Microsoft.ServiceBus, Microsoft.SignalRService, Microsoft.Storage, Microsoft.Web

Deleted from Microsoft.EventGrid

• stable/2018-01-01/SystemEvents.json - obsolete manual system events swagger
• stable/2018-01-01/examples/event-grid-schema/ - system event examples
• stable/2018-01-01/examples/cloud-events-schema/ - system event examples

Retained Files

• GeneratedSystemEvents.json (2018-01-01 and 2024-01-01 versions) - TypeSpec-generated system events
• EventGrid.json files (all versions: 2018-01-01, 2023-11-01, 2024-06-01) - REST operation swaggers
• REST operation examples - PublishEventsToEventGridTopic*.json and operation examples for newer versions

Configuration Updates

Updated readme.md to remove references to deleted files:

• Simplified package tags to only reference remaining EventGrid and GeneratedSystemEvents files
• Updated all-api-versions section to list only retained files
• Removed obsolete suppression rules for deleted ApiManagement files

Impact

• 395 files changed: 6 insertions(+), 18,783 deletions(-)
• All AutoRest configuration now points to valid files
• No breaking changes to REST operation specifications
• System events now exclusively use TypeSpec-generated schemas

Fixes the issue by removing all obsolete manual system event specifications while preserving the generated system events and all REST operation definitions.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Delete obsolete manual system event swaggers</issue_title>
<issue_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.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #38235

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