Manual export trigger flow in JAM

As a business manager I would like and option of exporting the order by clicking export button at the right time.

TD

Current export flow is fully automatic triggered by OrderExporter plugins, however there are cases when business managers would like manual control over the export process.

Plausible solution would be to create ManualStateOrderExporter which would allow setting a specific order export eligibility state and set the export blocked flag. This flag prevents any further automatic exporting.

Admin UI would react to combination of eligibility not empty and blocked flag set by exposing an export button. Clicking the export button would force the next eligible exporter to run.