feat: Use simple input field instead of multiselect for plain URLs

[juliushaertl]

When no link provider (except URL) is enabled a multiselect field might be confusing to users, so this PR switches over to a simple input field in that case.

[enjeck]

Weird that the test still fails on some stable branches :thinking:

[datenangebot]

How to reproduce this? I removed the provider stuff directly on db side like [{"columnId":1001,"value":"http://phpmyadmin.local"}] but there is no change on the front end?!

Thoughts:

• Is it possible to look for other resources if it is a plain url presented as a input?
• Wouldn't it be better if we change plain URLs to link providder URL and fetch the title from the url as title or subline?

[juliushaertl]

Sorry I should have described this a bit more. The goal of this PR is purely to make the input more user friendly if only URL is enabled as a provider for a column, as in this case the multiselect does not give any benefit as there is only one option to select (which is inserting the plain URL).

I agree we should still fetch the title and store/render it for additional context. Will look into that.