SQLite ODBC drivers use PRAGMA table_info to implement SQLColumns,
which doesn't return generated columns. This caused KiCad to silently
ignore any generated column configured in a .kicad_dbl file.
Now CacheTableInfo trusts user-configured column names and adds them
to the cache even if the ODBC driver doesn't report them. If a column
truly doesn't exist, the subsequent query will fail with a clear error
rather than silently omitting the data.
Also adds a test case with a table containing a virtual generated column.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/16952
Seth Hillbrand
8c34640520