Use media image's alt (and maybe title) on referencing image

The patch stopped applying, and since it's the year 2024, I created an MR and a pull request out of the patch. Looks to be working well, could use a review.

Reviwed and patch working fine for me.

Moving to RTBC.

It's quite unclear to me why this there is a use case of mixing direct file selection *and* media referenced, I would assume you'd use either one or the other. I can see it with multiple direct references to files from nodes, but limiting this specifically to media seems strange.

I suggest updating the issue summary with updated instructions on the use case around this and why it should be limited to nodes.

Also, the code should be more careful to verify that the reference is correct and the field exists, with things like revisions and multi-value fields, it might not actually select the media you think it does.