backport: Cannot rerun courses - authz role assignment expects rerun to already exist

[rodmgwgu]

This backports #38840 to Verawood. Fixes #38826.

It's identical to the master branch fix. See that PR for test instructions etc.

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[mariajgrimaldi]

@farhaanbukhsh - just letting you know I'm going to move forward and approve this. I'll be on the lookout for any regression. Thanks!

[mariajgrimaldi]

LGTM! Thanks again :)