"Use as Cover" on context menu for images

[arran4]

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• I have read CONTRIBUTING.md
• I have searched the existing requests and didn't find any that were similar
• I have considered creating a pull request instead and want to proceed

Clear and concise description of the problem

When you have a lot of pictures in your space and you want to re-use an image already referenced the object as the cover image for the object it can be a lot of work.

Suggested solution

Add to the context menu a "set image as cover image"

Alternative

Add a "from relation" or "from object" to the "Cover image"

Additional context

No response