BB-573 Restore code needed to set custom icon

[malinoff]

Same as #19496, but made against master branch.

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[natabene]

@malinoff Thank you for your contribution. Could you provide a more detailed description to help us understand the purpose of this?

[malinoff]

@natabene of course! The original request from our client is below:

The custom-set unit icons that we use to indicate video units (since Wistia video embeds are not detected) and downloads are missing from the LMS. It is no longer possible to set these in Studio either - that setting has been removed from the unit settings.

In other words, there was the setting in Ginko, but it is no more in Hawthorn.
I made a PR against the downstream edx repository and @xitij2000 asked me to create a PR for the upstream.

[natabene]

@malinoff Thank you for providing details. @marcotuts Can you have a look at this or do you want to send it to engineering review?

[xitij2000]

@natabene This is very much a WIP currently. Will ping when it is ready for review.

[natabene]

@xitij2000 Got it, thanks for the update.

[Agrendalath]

@natabene, could you please close this PR? This is not a desirable solution, as described in #19772.

[natabene]

@Agrendalath Sure, will do.

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[Agrendalath]

@natabene, thank you!