Show link to full execution logs when `rockcraft pack --debug` enters debug session
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Issue body
### What needs to get done
When `rockcraft pack --debug` exits in error, provide the user with the link to the full execution log before landing the user in the debug session.
### Why it needs to get done
The current state looks like this:
```
rockcraft pack --debug
'override-prime' in part 'backend' failed with code 1.
Launching shell on build environment...
root@rockcraft-katib-ui-on-amd64-for-amd64-19746510:~/project#
```
The user has no context as to what happened. If they then type `exit` and complete the rockcraft session, they're provided with:
```
2023-11-28 09:13:41.104 Full execution log: '/home/scribs/.local/state/rockcraft/log/rockcraft-20231128-091052.127801.log'
```
This log would be convenient to have when they hit the debug session. Otherwise they don't know what they're debugging, and the logical solution is to run the command once, `exit`, read the log, then relaunch the debug session
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