Add a "Copy Contents to Clipboard" option that copies an elided version of the stack trace

See https://bugreports.qt.io/browse/QTBUG-134718?focusedId=871742&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-871742 and the comment after it. Some of the functions in that trace have lots of arguments, so Creator shows them all and it makes it hard to read it.

It would be useful to have an option that copied an elided trace, maybe using the width of the columns in the Stack view, or a value configured in the debugger settings.