ubuntu-bug should provide option to copy link instead of always opening

[DuckDuckWhale]

Currently it always opens another tab directly via the web browser, which opens in the wrong Firefox container for me. It then always redirects and asks for me to sign in without the option of moving the tab inside the correct container. If I simply open it again in the correct tab, it tells me that no sign in is necessary and doesn't let me complete the original bug report.

[Benjamin Drung (bdrung)]

Can you provide steps to reproduce?

[DuckDuckWhale (duckduckwhale)]

1. Run `ubuntu-bug apport`
2. Complete the steps
3. A browser window opens without any option to copy a link instead. The link is also not shown in the terminal output.
4. It goes to https://bugs.launchpad.net/ubuntu/+source/apport/+filebug/UUID/+login
5. Because my default Firefox container had nothing, it asks me to log in
6. Copy and pasting the link in the right container says: "You are already logged in". It does not allow me to complete the bug report.

A fix can be to pop up a window to ask the user if it should open a new tab directly or just copy the link instead. Or at minimum output the initial link to standard output so that the user can do that manually.