Werk #16501: introduce command to start openapi-spec generation background job

Werk 15724 introduces a mechanism for regenerating the API specification, which, in certain instances, is executed as a background job due to the potential time required for completion. This update introduces a command to trigger the background job for the regeneration of the API specification. Users should be aware that triggering the job does not result in immediate availability of the updated documentation; there may be a delay before the documentation is updated. This saves the user from having to trigger and wait for the specification regeneration manually.

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