Truncate the display of very long PURLs

[pombredanne]

We should find a way to truncate the display of very long PURLs, may be with a trailing ellipsis "..." and a hover?

For instance, this is problematic: pkg:generic/confluent-community-7.8.0.tar.gz?download_url=https://packages.confluent.io/archive/7.8/confluent-community-7.8.0.tar.gz%253F_gl%253D1%252Ammrjby%252A_gcl_aw%252AR0NMLjE3MzY3ODk2NjQuQ2owS0NRaUFrSk84QmhDR0FSSXNBTWtzd3lnV0hjZjkzdVFJSlFlYTVzSl9lbmF0N3pMRGY2cjVMd19IRU1xQUNhRldYaVBCX3VGTWhsRWFBaVRJRUFMd193Y0I.%252A_gcl_au%252ANjM1NjIzODAzLjE3MzY3ODkzMzQuMTgwNzIwNjI3OS4xNzM2Nzg5ODU4LjE3MzY3ODk4NTk.%252A_ga%252AMTE4ODIzNzc5My4xNzM2Nzg5MzM1%252A_ga_D2D3EGKSGD%252AMTczNjc4OTMzNC4xLjEuMTczNjc4OTg2MC41OC4wLjA.%2526_ga%253D2.154106683.2092885578.1736789335-1188237793.1736789335%2526_gac%253D1.262641022.1736789664.Cj0KCQiAkJO8BhCGARIsAMkswygWHcf93uQIJQea5sJ_enat7zLDf6r5Lw_HEMqACaFWXiPB_uFMhlEaAiTIEALw_wcB

which comes from this URL:

https://packages.confluent.io/archive/7.8/confluent-community-7.8.0.tar.gz?_gl=1%2Ammrjby%2A_gcl_aw%2AR0NMLjE3MzY3ODk2NjQuQ2owS0NRaUFrSk84QmhDR0FSSXNBTWtzd3lnV0hjZjkzdVFJSlFlYTVzSl9lbmF0N3pMRGY2cjVMd19IRU1xQUNhRldYaVBCX3VGTWhsRWFBaVRJRUFMd193Y0I.%2A_gcl_au%2ANjM1NjIzODAzLjE3MzY3ODkzMzQuMTgwNzIwNjI3OS4xNzM2Nzg5ODU4LjE3MzY3ODk4NTk.%2A_ga%2AMTE4ODIzNzc5My4xNzM2Nzg5MzM1%2A_ga_D2D3EGKSGD%2AMTczNjc4OTMzNC4xLjEuMTczNjc4OTg2MC41OC4wLjA.&_ga=2.154106683.2092885578.1736789335-1188237793.1736789335&_gac=1.262641022.1736789664.Cj0KCQiAkJO8BhCGARIsAMkswygWHcf93uQIJQea5sJ_enat7zLDf6r5Lw_HEMqACaFWXiPB_uFMhlEaAiTIEALw_wcB

display this way in the UI which is messy:

and

[tdruez]

Addressed in #248