Remove SQL Server upgrade scripts and code

[labkey-jeckels]

Rationale

We no longer support SQLServer as a primary DB

Changes

• Remove schema upgrade scripts
• Remove SQLServer conditional code
• Remove SupportedDatabases in module.properties
• Remove uses of PostgresOnlyTest
• Remove Naturalize CLR management and use as there are no known uses on external schemas/DBs

[labkey-jeckels]

@bbimber most of this is straightforward and mechanical, but please see my notes about the CLR. No rush to review. I restored the "include" upon review since it was part of the index name (if not actually impacting the index itself on PG)