Import operation updates on the UI cease once the browser tab is closed

[rishighan]

When the user initiates an import by going to Import > Start Import the import endpoint is hit, and the actual import job queue starts processing the import jobs.

However:

1. If the user closes the browser tab and re-opens it, the import state is reset
2. If the user quits the browser and re-opens it, navigating back to ThreeTwo's import page, the import state is reset

Both are poor UX patterns, misleading the user into thinking that the import operation stalled or errored out.

[rishighan]

This PR: rishighan/threetwo-core-service#6 is meant to address the queue automation somewhat

[rishighan]

#87 as well.

[rishighan]

@nstephenh Pending your verification, I can close this issue.