fix: Course blocks API with param return_type=list 34379

[qasimgulzar]

Issue Description

Version: Quince.1
Discussion: edx (New).
Endpoint: {LMS_HOST}/api/courses/v1/blocks/?course_id={COURSE_ID}&return_type=list

Console log:

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[e0d]

Tests have passed, removing the flag.

[jsnwesson]

@mphilbrick211 Looks like the Aurora team owns this Course API, so i'll be pinging them to be aware of this PR!

[mphilbrick211]

@mphilbrick211 Looks like the Aurora team owns this Course API, so i'll be pinging them to be aware of this PR!

Thanks, @jsnwesson, though I don't think Aurora is reviewing these anymore.

[jsnwesson]

Approving/merging since this was already approved/merged for the master branch in #34424 , apologies for leaving this hanging for so long!

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