correct for FK reflecting on PK / index col at the same time

correct for FK reflecting on PK / index col at the same time

Fixed issue in the MSSQL dialect's foreign key reflection query where
duplicate rows could be returned when a foreign key column and its
referenced primary key column have the same name, and both the referencing
and referenced tables have indexes with the same name. This resulted in an
"ForeignKeyConstraint with duplicate source column references are not
supported" error when attempting to reflect such tables. The query has been
corrected to exclude indexes on the child table when looking for unique
indexes referenced by foreign keys.

Fixes: #12907
Change-Id: I435d4cf3bfa9e861cbb5e1e5c8c81bd59c9a9d58