Webui: Add functionality to copy workitem's storagepath / buildkey

In current implemenetation of the web front-end, in order to find workitem log information, etc., the user needs to manually parse the buildkey or storagepath from the workitem's log url, which could be made easier.

To avoid the manual parsing, we could add a link or buttons to copy the buildkey and its storagepath to clipboard in the logviewer and integration detail javascript code.