[FAL-2076] Cherry-pick celery fixes on Koa.3#367

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pomegranited merged 4 commits intoopencraft-release/koa.3from

jill/celery-fixes-koa.3

Jul 8, 2021

Commits on Jun 24, 2021

Update celery routing for celery 4+ (#25567)

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pomegranited
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fix: add missing set_code_owner_attribute imports

gabor-boros
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chore: bump edx-django-utils to 3.12.0

gabor-boros
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Shimul Chowdhury
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Commits on Jul 6, 2021

fix: use high priority queue for celery heartbeat check

Shimul Chowdhury
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