Change Storage put_directory to only count the number of files uploaded

[taljaards]

Deployment().upload_to_storage() returns the number of files uploaded (obtained from the relevant storage/filesystem put_directory()). It caught me off-guard in that it seems to upload more files than I have in my folder.

Example

I found, for example, for the test tree-project, it returns 7 files uploaded.
That is because it also counts the folders.

Important: This PR changes the behavior of the file counter to only count the files, and not the folders as well.

Checklist

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[zanieb]

Thanks makes sense to me!