Re: Non-text mode for pg_dumpall

hi.

just a quick response for v15.

the pg_restore man page says option --list as "List the table of
contents of the archive".
but
$BIN10/pg_restore --format=directory --list --file=1.sql dir10
also output the contents of "global.dat", we should not output it.

in restoreAllDatabases, we can do the following change:
```
    /* Open global.dat file and execute/append all the global sql commands. */
    if (!opts->tocSummary)
        process_global_sql_commands(conn, dumpdirpath, opts->filename);
```


what should happen with
$BIN10/pg_restore --format=directory --globals-only --verbose dir10 --list

Should we error out saying "--globals-only" and "--list" are conflict options?
if so then in main function we can do the following change:

```
if (globals_only)
{
    process_global_sql_commands(conn, inputFileSpec, opts->filename);
    if (conn)
        PQfinish(conn);
    pg_log_info("databases restoring is skipped as -g/--globals-only
option is specified");
}
```


in restoreAllDatabases, if num_db_restore == 0, we will still call
process_global_sql_commands.
I am not sure this is what we expected.