refactor!: Standardise CronjobController action names and types

[Mrtenz]

This renames all CronjobController action and event names and types to follow the Controller...Action pattern used in most other controllers.

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Note

Medium Risk
Primarily a type-level refactor but marked breaking because exported action type names and cronjob exports change; downstream TypeScript code and messenger typings may need updates.

Overview
Standardizes CronjobController messenger action typing. The PR moves cronjob method action definitions into a new auto-generated CronjobController-method-action-types.ts, renaming the exported action types to the CronjobController…Action convention.

CronjobController now wires its messenger via registerMethodActionHandlers with an explicit MESSENGER_EXPOSED_METHODS list, and narrows messenger generics by separating controller actions/events from externally allowed ones. Public exports from cronjob/index.ts are adjusted accordingly, and the changelog is updated to document the new breaking action type names (including CronjobControllerScheduleAction, CronjobControllerCancelAction, CronjobControllerGetAction).

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[Mrtenz]

This didn't need to be exported.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Partials                        ?        0           

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