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

[labkey-jeckels]

@bbimber this repo was very straightforward.

[bbimber]

Even though it's a change from existing behavior, I'd like to restore natural sorting on these columns for PG. I can check in a change unless you are able to.

[labkey-jeckels]

Even though it's a change from existing behavior, I'd like to restore natural sorting on these columns for PG. I can check in a change unless you are able to.

Sounds good. Go for it at your convenience. I've intentionally done these PRs such that they can be merged independently and then we'll do a followup small cleanup to actually delete things like the PostgresOnlyTest marker interface.

change added