Deployment revision preset GQL Create/Update inputs missing many DTO fields (including image_id)

[jopemachine]

Background

Discovered while investigating BA-5932.

Problem

CreateDeploymentRevisionPresetInputGQL and UpdateDeploymentRevisionPresetInputGQL are missing many fields defined in the underlying DTOs (CreateDeploymentRevisionPresetInput, UpdateDeploymentRevisionPresetInput). Most critically, image_id is missing from both, so the GQL create mutation cannot succeed (DTO requires it) and the GQL update mutation cannot change the image.

Missing in Create input

• image_id (REQUIRED in DTO)
• description, model_definition, resource_slots, resource_opts, cluster_mode, cluster_size, startup_command, bootstrap_script, environ, preset_values

Missing in Update input

• image_id, model_definition, resource_slots, resource_opts, cluster_mode, cluster_size, startup_command, bootstrap_script, environ, preset_values
• description default is None instead of UNSET, which does not map to DTO SENTINEL (no-op semantics broken).

Acceptance Criteria

• All DTO-defined fields are exposed on both GQL Create and Update inputs.
• Sentinel-backed fields use UNSET defaults so no-op semantics work.
• Existing REST v2 behavior is unchanged.
• Create / Update via GQL mutation succeed end-to-end with image_id.

JIRA Issue: BA-5937