improve prompt translation support for Conversation related types

[jmartin-tech]

Identified by @aishwaryap, when processing prompts of type Message or Conversation strict type awareness is required.

• wrap single string in list
• extract first result

Verification

List the steps needed to make sure this thing works

• added test validate type check for impacted probes

[aishwaryap]

Can we sneak in another related bug fix here? Lines 402-418 also currently assume self.prompts is a List[str].

The correct code snippet needed here is:

for seq, prompt in enumerate(prompts):
            notes = None
            if self.langprovider.target_lang != self.lang:
                if isinstance(prompt, str):
                    notes = {
                        "pre_translation_prompt": garak.attempt.Conversation(
                            [
                                garak.attempt.Turn("user", garak.attempt.Message(prompt, lang=self.lang))
                            ]
                        )
                    }
                elif isinstance(prompt, garak.attempt.Message):
                    notes = {
                        "pre_translation_prompt": garak.attempt.Conversation(
                            [
                                garak.attempt.Turn("user", garak.attempt.Message(prompt.text, lang=self.lang))
                            ]
                        )
                    }
                elif isinstance(prompt, garak.attempt.Conversation):
                    notes = {
                        "pre_translation_prompt": prompt
                    }
                    for turn in prompt.turns:
                        turn.content.lang = self.lang
 
            attempts_todo.append(self._mint_attempt(prompt, seq, notes, lang))

[leondz]

lgtm

[leondz]

oh, nice catch @aishwaryap !