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 !118 with work/37-qtwebkit-v-qtwebengine-discussion in 1 minute and 29 seconds (queued for 233 minutes and 7 seconds)
Status Name Job ID Coverage
failed linux kf5-qt5 qt5.15 #146085


Name Stage Failure
linux kf5-qt5 qt5.15 Build

-- Generating done
CMake Generate step failed. Build files cannot be regenerated correctly.
Uploading artifacts for failed job
Uploading artifacts...
WARNING: JUnitTestResults.xml: no matching files
ERROR: No files to upload
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1