PHPC-1090: Do not use CommandException for MONGOC_ERROR_COMMAND domain
PHPC-1090: Do not use CommandException for MONGOC_ERROR_COMMAND domain

In libmongoc error API v2, the command domain no longer used for errors originating from the server. It is relegated to MONGOC_ERROR_PROTOCOL_BAD_WIRE_VERSION and MONGOC_ERROR_COMMAND_INVALID_ARG, both of which are client-side errors.

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