Improve UX when GDM does not start

“when gdm doesn’t start, display a text mode message with the graphic card hw info and a shortened link to our known issues page / help desk”

I volunteered to do it, anonym offered to take it over. sajolida volunteered to write the text we should display.

Feature Branch: feature/14521-improve-UX-when-GDM-fails-to-start

Original created by @intrigeri on 14521 (Redmine)

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