SONAR-6366 split ruby upgradeAndStart into three Java steps

modified ruby scripts used by RubyBridge to define and instance a class instead of only define a method alone because mapping such script to a Java interface works only for the first script (at least in unit tests)
split upgrade_and_start from Ruby into two seperate Ruby tasks (trigger ActiveRecord migration on one side and web route (re)creation on the other) and a pure Java task to restart the container