Fix inadvertent parameter optionality changes in create methods

[Copilot]

Two create() method signatures were inadvertently changed from optional to required parameters during JSDoc additions, breaking backward compatibility.

Changes

• schedule_collection.ts: Restored create(schedule?: ScheduleCreateOrUpdateData) parameter optionality
• webhook_collection.ts: Restored create(webhook?: WebhookUpdateData) parameter optionality

Both methods use ow.optional.object validation internally, confirming the parameters should be optional.

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[Copilot]

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