fix: dinamically get the block-id version

[Ian2012]

Description: This PR dinamically gets the block-id version from the block_id string. Support CCX courses.

Testing instructions:

1. Enable CCX courses
2. Configure a Course as a CCX master
3. Create a CCX child course
4. Emit a video event and a problem event
5. Make sure the corresponding xAPI event has the block ID serialized correctly, verifying that the object.id URL points to the right CCX object.

[openedx-webhooks]

Thanks for the pull request, @Ian2012! 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.

[felipemontoya]

This changes look reasonable to me.

I'm wondering [not blocking] if it is worth it to extract the ccx check to a function that can be reused in the two places that it is used here, but probably other places in the future?

[bmtcril]

This looks good to me, but I agree with @felipemontoya that the block version line should be abstracted out so it can be reused.

[Ian2012]

@ziafazal do you see a case where the data can be None in any of the subclasses of BaseProblemCheckTransformer. That's not covered by tests currently and I don't see any case where that could happen on problem_check events.

@bmtcril already refactored

[bmtcril]

I think this is ok, we know that it's safe to return None here since we were already doing that. If you're not going to add a test to cover that line, though, can you add a # pragma: no cover to it?

[bmtcril]

LGTM

[openedx-webhooks]

@Ian2012 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.