Handle preview/download/file size for files in Bucket storage

[apdavison]

The "Result files" tab on the validation result detail page doesn't work properly where files have been uploaded to EBRAINS Bucket storage:

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This will require additions to ResultRelatedFiles.js, in the ResultFile and possibly the ResultRelatedFiles classes.

Some of the problems: the Bucket/Data proxy API does not support using HEAD requests to get file sizes, instead need to use the GET /v1/buckets/{bucket_name}" endpoint to get information for all files in a given bucket/folder, and probably the "GET
/v1/buckets/{bucket_name}/{object_name}" endpoint to get download links.

[apdavison]

For reference, here is an example of how the view should look (here with files stored in the EBRAINS Drive storage, which is supported).