Show full job names in checkbox tooltips when configuring list views

This adds a 'tooltip' attribute to /lib/form's checkbox which will be rendered as an HTML 'title' attribute. This new attribute is then used in list views' configuration screens to show the full job name in the tooltip when hovering.

Reason for this PR is explained in [JENKINS-18719](https://issues.jenkins-ci.org/browse/JENKINS-18719). Short version: *Use a regular expression to include jobs into the view* requires users to be able to determine actual job names.