Add "List content" operation to the content type administration page

I'm not actually sure if there's a good way to achieve this. For example, what happens if a user changes the key of the type filter in the Content view? Those links would now be broken.

As per #50 it doesn't look like we should go with the operation so I'm removing the Needs tests tag since we'd need a new solution.

Closing this as won't fix based on #50 and #52

If anyone feels strongly that this should be implemented and has a way around the limitations mentioned, feel free to reopen this.

xjm → credited benjifisher → .

xjm → credited rkoller → .

xjm → credited simohell → .

For #52, how this works with other types is that there is an entity list handler that provides the link, which is then overridden by the view. If the view is altered to no longer provide the operation, then it would fall back to the basic handler (I think).

That said, I'm also a bit skeptical of the proposed alternate approach, and of introducing a new pattern just for this; a separate column seems equally problematic to an operation link for me. So (committer hat on) I also agree with the wontfix here, given that there isn't a clear UX win. If we want to close the loop for site administrators on this somehow, we should probably start from scratch with design.

Adding credits from the usability meeting and for various reviewers and maintainers.

Thanks everyone!