Add test cases for all filetypes with more than 100 uploads in the last 1,000,000 on BC3

[tomafro]

• .jpg
• .pdf
• .png
• .docx
• .xlsx
• .zip
• .pptx
• .doc
• .mp4
• .xls
• .gif
• .jpeg
• .psd
• .ai
• .csv
• .mp3
• .mov
• .txt
• .tif
• .xlsm
• .html
• .wav
• .key
• .svg
• .pages
• .ppt
• .rtf
• .tiff
• .xml
• .apk
• .numbers
• .sketch
• .bmp
• .xlsb
• .json
• .swf
• .js
• .dotx
• .log
• .eps
• .dwg
• .msg
• .rar
• .m4a
• .indd
• .htm
• .eml
• .otf
• .odt
• .ttf
• .fmp12
• .m4v
• .sql
• .pub
• .7z
• .nef
• .cr2
• .ods
• .vsd
• .dxf
• .amr
• .gsheet

[rosa]

@tomafro this might be relevant for .xlsx, .docx, .pptx. I think we are failing right now to correctly map all those file types if they were generated with something else than Microsoft Office. If that pull request doesn't make it to mimemagic, we could also stop using the custom mimemagic/overlay and add our own instead.