CAMEL-20823 Filter out folders when listing files

[cunningt]

https://issues.apache.org/jira/browse/CAMEL-20823

From my read of the code, I think the intention is to only list files in the poll of the consumer? If it is preferable to list both files and folders, we could have a separate if path here which handles Directory dir = share.openDirectory() at

https://github.com/apache/camel/blob/main/components/camel-smb/src/main/java/org/apache/camel/component/smb/SmbConsumer.java#L75

Getting an exception now if the share has directories in it.

[github-actions]

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[orpiske]

LGTM, thanks!