Fix table syncing with different column order

Logical replication supports replicating between tables with different
column order.  But this failed for the initial table sync because of a
logic error in how the column list for the internal COPY command was
composed.  Fix that and also add a test.

Also fix a minor omission in the column name mapping cache.  When
creating the mapping list, it would not skip locally dropped columns.
So if a remote column had the same name as a locally dropped
column (...pg.dropped...), then the expected error would not occur.

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