Generated models and request builders

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[peombwa]

Approving. The IsManualApprovalEnabled/IsWaitlistEnabled removal flagged by the public API surface check is a false positive.

I verified both the OpenAPI spec and the generated code on this branch:

• In openapi.yaml, isManualApprovalEnabled and isWaitlistEnabled moved from the virtualEventWebinarRegistrationConfiguration schema up to its base schema, virtualEventRegistrationConfiguration.
• In the generated code, VirtualEventRegistrationConfiguration now declares both properties (with serialization for isManualApprovalEnabled/isWaitlistEnabled handled there), while VirtualEventWebinarRegistrationConfiguration (which still inherits from it) no longer redeclares them - its Serialize/GetFieldDeserializers just delegate to base.

Since VirtualEventWebinarRegistrationConfiguration still inherits from VirtualEventRegistrationConfiguration, existing consumer code calling webinarConfig.IsManualApprovalEnabled / .IsWaitlistEnabled continues to compile and behave identically - the properties are just inherited now instead of declared on the derived type. The JSON wire format is unchanged. No source or binary compatibility impact.