All process instance indices should have a corresponding archive index for which data will be archived too

ATs:

• We create an archive index whenever we create a process instance index
• The index has the same schema as the process instance index (maybe can be versioned in line with it too for consistency)

Testing Notes:

There is a schema upgrade in this PR. We should therefore test that data data import works before and after upgrade. This should cover the following imports:

• Engine data import
• External Variable import (and making sure they get added to instances)
• Event based processes import (and making sure they get added to instances). Also includes the counts and autogeneration features accuracy