[NEOS-1398] Disable truncate and on conflict options in sql server

[nickzelei]

Truncate table is ineffective for any table with foreign key constraints.

The workaround is to do

DELETE FROM TABLENAME
DBCC CHECKIDENT ('DATABASENAME.dbo.TABLENAME', RESEED, 0)

But it can be really slow for large tables.

We may want to implement this anyways as it is our only viable workaround, but for now we will just disable and add support for later.

Mssql also does not support on conflict so we should disable it in the UI until we can offer something equivalent (if even possible)

_{From SyncLinear.com | NEOS-1398}