[Teak Backport] feat: course authoring unit sidebar slot v2

[tecoholic]

Description

Teak backport of #2000

Supporting information

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Testing instructions

See: #2000

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• Does this change depend on other changes elsewhere?
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[tecoholic]

@farhaanbukhsh I have tested this alongside edx-platform release/teak in a tutor environment.

[farhaanbukhsh]

👍

• ✅ I tested this using the tutro devstack
• ✅ I read through the code
• ❌ I checked for accessibility issues
• ✅ Includes documentation