Dave Lee bfe2994560
[lldb] Fix minor runCmd error message formatting (#110150)
This tweaks the construction of the error message when using `expect`/`runCmd`. With 
this change, the stdout/stderr is placed after the message "Command '<command>' did not 
return successfully".

Before:
```
AssertionError: False is not True : Command 'p whatever
Error output:
error: <some error message>
' did not return successfully
```

After:
```
AssertionError: False is not True : Command 'p whatever' did not return successfully
Error output:
error: <some error message>
```
2024-09-26 13:39:54 -07:00
..