imap: handle the NonExistent attribute

Treat the "\NonExistent" attribute similar to the "\NoSelect" one. Only
list folders without the "\NonExistent" or "\NoSelect" attribute.

According to RFC 9501, section 7.3.1, the "\NonExistent" attribute
implies "\NoSelect".

When using the LIST-STATUS extension, some servers return a
"\NonExistent" flag instead of the "\NoSelect" one. We only check for
the "\NoSelect" attribute, and hence, a "\NonExistent" folder will
appear in the directory list and raise an error when being selected.

This occurs, e.g., for gmail accounts with the "[Gmail]" folder.

Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>

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