Binary/Test Downloader tab in Dashboard

A new tab, "Binary/Test Downloader", has been added to Dashboard.
For details, please refer to;
https://dune.github.io/computing-HWDB/dashboard/index.html#binarytest-downloader-tab

In short, the new tab allows to download stored various test data as well as binaries such as images, docs, csv files, for multiple PIDs at once for a given Component Type ID.