Code block containing URL gets corrupted

[KaKi87]

Requirements

• [x] This is a bug report, and if not, please post to https://lemmy.ml/c/lemmy_support instead.
• [x] Please check to see if this issue already exists.
• [x] It's a single bug. Do not report multiple bugs in one issue.
• [x] It's a frontend issue, not a backend issue; Otherwise please create an issue on the backend repo instead.

Summary

Submitting a post or comment on Lemmy with the following :

```javascript
const url = `https://example.com?foo=${bar}`
```

Gets turned into the following :

```javascript
const url = `https://example.com/?foo=%24%7Bbar%7D`
```

Diff :

Steps to Reproduce

1. Write this code block as a post or comment ;
2. Submit ;
3. Notice difference.

Technical Details

Not relevant

Lemmy Instance Version

0.19.12

Lemmy Instance URL

https://jlai.lu/comment/15092350

[Nutomic]

Confirmed

[Nutomic]

This problem is caused by the url cleaner added in https://github.com/LemmyNet/lemmy/pull/5018. It needs to ignore text inside of code blocks, probably by converting it to a markdown-it plugin and working similar to markdown_rewrite_image_links().