create collations in the public schema
create collations in the public schema

simplifies lots of things, and it doesn't really matter _which_ schema a collation is in

Change-Id: Iaab931dfcb039cd29dfcabcf0d0b198d21e8b3cf
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/242525
Reviewed-by: Jacob Burroughs <8ecea6e385af5cf9f53123f5ca17fb5fd6a6d4b2@instructure.com>
Reviewed-by: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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