[info] Handle identifiers visible even for unvisible datasets/files

[dalito]

This is to inform about a dataverse limitation reported by "our" @vkush in IQSS/dataverse#8881

Since the URLs in the handle record do not disclose any information about the dataverse/organisation/dataset/file via the url-scheme the visiblity of the handle should be no problem.

For example, see this handle record for a file

https://hdl.handle.net/21.11165/4Cat/a48r-4u58/1?noredirect=true

It does not contain any information about the resource it links to.

[dalito]

@vkush - maybe we need another tag to identify upstream issues (in dataverse) that we can/will not solve ourselves like this one.

[vkush]

"external" tag is created.