Does not use group_completion_job_id when polling for job completion and using burst_pdf

[erickreutz]

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[erickreutz]

Even when I do fix it to poll on the group completion id the method hangs for a while and eventually returns nil.

https://github.com/erickreutz/blitline/commit/fad48e01327764c88fb409cbd98281fca9cc76dc