feat: Add a csv report of xblocks used in courses

[samuelallan72]

WIP!

Description

Add a report that is a CSV table of all components in a course, with their xblock types. The aim of this report is to be able to audit xblocks are used.

Also add a button to the instructor dashboard to generate the report.

NOTE: this report only includes information on published units in the course.

Supporting information

Private-ref: https://tasks.opencraft.com/browse/BB-10225

Testing instructions

• Deploy this patch and ensure at least one course with a variety of content is on the instance (eg. the demo course)
• log in as an admin, and navigate to the "data download" tab of the instructor dashboard.
• scroll down and click the "download xblocks list as a csv" button.
• refresh the page after a moment and find the csv under the "Reports Available for Download" section
• View the csv and verify for accuracy

Deadline

None

Other information

N/A

Note that the instructor dashboard is deprecated, so if we do end up putting this on the instructor dashboard, ultimately this may need porting to an MFE replacement for the instructor dashboard.

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