[Backport: Redwood] fix: reindex_studio was crashing if instance had too many courses

[bradenmacdonald]

This backports #34905 to fix openedx/modular-learning#223 in Redwood.

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Feel free to add as much of the following information to the ticket as you can:

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[openedx-webhooks]

Thanks for the pull request, @bradenmacdonald! Please note that it may take us up to several weeks or months to complete a review and merge your PR.

Feel free to add as much of the following information to the ticket as you can:

• supporting documentation
• Open edX discussion forum threads
• timeline information ("this must be merged by XX date", and why that is)
• partner information ("this is a course on edx.org")
• any other information that can help Product understand the context for the PR

All technical communication about the code itself will be done via the GitHub pull request interface. As a reminder, our process documentation is here.

Please let us know once your PR is ready for our review and all tests are green.

[pomegranited]

👍

• I tested this on my redwood dev stack like this
• I checked the code against the original PR

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