Update DatabaseErrorPageMiddleware experience to promote migration bundles

[AndriySvyryd]

#19587 is a more maintainable, robust and secure way of doing this.

[ajcvickers]

Things to consider:

• Directly directing people to do this the "right" way from the beginning
• If we need to keep having a button to create the database, then consider having it somehow use a bundle
• Add more text, links, etc. to direct people to bundle guidance.