Code formatting for Leo responses

[petemill]

Identify which parts of Leo's response is code, and format appropriately.

Figma: https://www.figma.com/file/MNwi0uwXNhkAbPiJ86G4vm/%F0%9F%A7%A0-Leo?type=design&node-id=1592-7938&mode=design&t=mmPIf91aKWeWk2PA-0

[petemill]

@LorenzoMinto do you have any preferences?

[LorenzoMinto]

From quickly skimming the paper, Codellama seems to have been trained both with ```, ```{language} or even [{language}]...[/{language}] tags (i.e. [PYTHON]...[\PYTHON], similar to the instruction ones). I guess we could use the traditional ``` (or ```{language}) also to be consistent with what we are going to expect from other models

[thypon]

Are we planning/using markdown anywhere there?

[kjozwiak]

Adding QA/Blocked for now as the above was merged into cr121-1.62.x via brave/brave-core#21593. Once C121 is merged into 1.62.x via brave/brave-core#21593, we'll unblock the above and mention the needed 1.62.x version for verification 👍

[kjozwiak]

The above requires 1.62.148 or higher for 1.62.x verification 👍

[stephendonner]

Verification PASSED using

Brave | 1.62.149 Chromium: 121.0.6167.75 (Official Build) (x86_64)
-- | --
Revision | ff84587bd70af9fcbcbe59fc5194ca65082759c4
OS | macOS Version 11.7.10 (Build 20G1427)

Steps:

1. installed 1.62.149
2. launched Brave using --env-leo=staging --env-ai-chat.bsg=dev --env-ai-chat-premium.bsg=dev
3. subscribed to Premium using jan22@mailinator.com from account.bravesoftware.com
4. clicked on Leo
5. typed test
6. clicked on Accept and begin
7. confirmed default choice of Mixtral LLM
8. asked Leo to write "Hello, world" programs in different languages

Confirmed Leo (Mixtral) correctly formatted the test programs, as well as the Copy code button

C++ - PASSED

Code sample:

#include <iostream>

int main() {
    std::cout << "Hello, world!" << std::endl;
    return 0;
}

JavaScript - PASSED

Python - PASSED