fix: handle block.xml content properly

[dwong2708]

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[ormsbee]

We use a custom media type per block type. We're going to have to refactor this later, but for now please use the same one we do here:

https://github.com/openedx/edx-platform/blob/067ca72ed02a2316945d77d045fe85d5b9d3c3bd/openedx/core/djangoapps/content_libraries/api/blocks.py#L656-L658

That is to say, f"application/vnd.openedx.xblock.v1.{block_type}+xml"

[ormsbee]

So a <problem> block's OLX gets application/vnd.openedx.xblock.v1.problem+xml

[dwong2708]

This is done. I apologize for the late change requests, and I really appreciate your support

[ormsbee]

No worries! Thank you for all the crunch work. Merged and published v0.29.1 of the package.