[cern] Display single (publicly) shared _file_ in dedicated view

[pascalwengerter]

Expected behavior

When opening a public link that only refers to a single file, it should not be opened in a table or tiles view but in a dedicated view. CERN offered their implementation which lives on #8440 and roughly looks like this:

[tbsbdr]

relates to 44f5d2c

[tbsbdr]

question to @elizavetaRa
does the current implementation suit your needs regarding:
Single file share view

especially: link to a folder that contains a single file: show regular list view (even though the folder contains only 1 file)

[tbsbdr]

weekly:
expected behaviour:

• link to a folder that contains a single file: show regular list view (even though the folder contains only 1 file) @JammingBen