feat: course unenroll is configureable and its slot is added

[marslanabdulrauf]

Related Ticket (internal)

https://github.com/mitodl/hq/issues/4657

Related Confluence

https://openedx.atlassian.net/wiki/spaces/OEPM/pages/4363419652/Proposal+Improved+Un-enrollment+Experience+for+Enhanced+User+Satisfaction?focusedCommentId=4448550936

Description:

This PR:

1. Make Unenroll survey configurable through environment variable
2. Create Slot for UnenrollReasonPane

How to test

coming soon ...

[openedx-webhooks]

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[itsjeyd]

Hi @marslanabdulrauf, thank you for this contribution!

What's the status of the product proposal, has it been accepted?

And if you haven't already, could you please create a GitHub Issue for the proposal so it can be tracked on the Open edX Roadmap?

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💡 As a side note, the product review process was recently updated, so if you need a refresher please check out the Open edX Product Contribution Guide, and the Product Proposal contribution type in particular (which applies here).