[WIP] [TEST] Fix this PR for me (ignore if you're a person)

[Copilot]

Fixed broken EventGrid SDK by addressing key issues from the system events regeneration:

Progress Report

• Identify the main issues: The SDK regeneration incorrectly replaced all existing models with system events only
• Fix main init.py: Restored proper client exports instead of incorrect __path__ extension
• Fix tsp-location.yaml: Replaced placeholder values with proper commit and repo references
• Restore missing ReleaseDelay enum: Added back the enum required by consumer client operations
• Restore missing consumer client models: Added back essential models (CloudEvent, BrokerProperties, etc.)
• Update model exports: Added all restored models to init.py imports and all lists
• Verify imports: Confirmed EventGridPublisherClient, EventGridConsumerClient, and key models import successfully
• Commit changes: Successfully committed all fixes to restore SDK functionality

What was Fixed

1. Main init.py file: Was incorrectly changed to __path__ extension, now exports actual client classes
2. Missing consumer client models: Restored CloudEvent, BrokerProperties, ReceiveDetails, PublishResult, etc.
3. Missing ReleaseDelay enum: Added back for consumer client operations
4. tsp-location.yaml: Fixed placeholder values with actual repo/commit references
5. Import chain: Fixed all import errors in the dependency chain

Result

The EventGrid SDK now imports successfully and provides both:

• Publisher Client: For sending events to Event Grid
• Consumer Client: For receiving and managing events from Event Grid Namespaces
• System Events Models: All the new system event models from the regeneration
• Compatibility: Maintains backward compatibility with existing consumer client functionality

The PR is now ready for review and should pass all import validation checks.

Fixes #41772.

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