Report incompatible modules on status report page

Problem/Motivation

Now that 🐛 Alteration of validation and submit callbacks can cause conflicts Fixed is close to a fix, reporting the problem to the user is the next step. Debugging this can take hours, so this would be a great help and will speed things up.

Steps to reproduce

Install lt, uep and urp and presto: issue time (without any notice).

Proposed resolution

Implement hook_requirements() and check for lt and uep.

Remaining tasks

Test the patch.

Note: Also added both lt and uep on the project page as incompatible.