Remove the Copy Report to Clipboard functionality

This feature was added in the first implementation of the reports view
and is rather redundant, given that the export functionality exists and
works well.

Removing it simplifies the codebase and the stylesheet usage.
1 job for work/37-qtwebkit-v-qtwebengine-discussion in 8 minutes and 1 second (queued for 225 minutes and 6 seconds)
Status Name Job ID Coverage
passed build_local_ubuntu_2004 #146084