kunit: tool: Accept --raw_output=full as an alias of 'all'

I can never remember whether --raw_output takes 'all' or 'full'. No
reason we can't support both.

For the record, 'all' is the recommended, documented option.

Link: https://lore.kernel.org/r/20250730031624.1911689-1-davidgow@google.com


Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Rae Moar <rmoar@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>