Fixed JENKINS-26312, JENKINS-26298 and JENKINS-26306

Attempt to do it in pure CSS ala 3e9cdcbc failed so using CSS and JS combo.

This reverts commit 3e9cdcbc.

[JENKINS-26281] Allow users to delete builds even if they are supposed to be kept

Update Guice to 4.0-beta5

Don't extend a test class from org.junit.Assert to use its static methods.

* to simplify the static import and test use Hamcrest to compare arrays
* no need to box boolean[] to Boolean[] when using Hamcrest

statically import methods used from org.junit.Assert

* that's a common practice so do it consistently in all tests

If a project action fails to load we should log the project action and continue to load the project.

Conflicts:
	test/src/test/java/hudson/model/ItemGroupMixInTest.java

replace all deprecated @Bug annotations with @Issue

[JENKINS-22811] Folder loading can break when an item inside the folder fails to load or throws an Exception.

migrate tests from using HudsonTestCase to JenkinsRule

* these are simple tests without Jelly files or actions implemented in the test class

Jenkins was failing to log exceptions from raw Runnable/Callable sent to Timer (without using SafeTimerTask, PeriodicWork, etc.).

Fixed min/max operations in ComputerRetentionWork