Fix unique statement formatting in MSSQL dialect

[ben-agnew]

This pull request introduces a small change to the formatting of unique constraint statements in the createTableUniques function. The change ensures that each unique constraint statement ends with a comma and newline, rather than conditionally ending with only a newline for the last item.

Due to the ordering of the statements, there would be a syntax error if a "check" is present in the table. Removing the index check aligns the behavior with the other statements.

• Formatting update: Modified the logic in the createTableUniques function in drizzle-kit/src/dialects/mssql/typescript.ts so that each unique constraint statement ends with ,\n regardless of its position in the list.