This change both speeds up specs (less strings to allocate) and helps catch
cases where methods in Discourse are mutating inputs.
Overall we will be migrating everything to use #frozen_string_literal: true
it will take a while, but this is the first and safest move in this direction
This commit adds a new tracking table that lets us know
- When a migration ran
- What version Discourse was at
- How long it took
- What version Rails was at
The built in tracking in Rails is very limited, does not track this info
