Remove Package[mediawiki-math] from role::math

Be explict in listing the package dependencies for the math role rather
than relying on the Ubuntu mediawiki-math package. The Ubuntu package
installs unwanted packages (mediawiki, mediawiki-extensions-math,
mediawiki-math-texvc). Also add related packages that have historically
been provided by the wikimedia-task-appserver package in production.

Since we are adding so many packages and they have an incredibly low
probability of conflicting with other roles move the packages directly
into the role rather than making package::* wrapper classes for them.

Bug: 66807
Change-Id: If11a15a37069462437d7fa5ad348739ae5792684