[lexical-markdown] Add test to keep code language

[local-dev-korbit-ai-mentor]

[lexical-markdown] Bug Fix: preserve language tag for Markdown code

Right now, PR contains only one commit with tests to highlight the problem.

If the markdown file contains a code block with an unsupported language (a language for which the project doesn't have syntax highlighter) the lexical will remove any information about that language.

Let's say we have markdown with the following content:

```rust
fn main() {
    println!("Hello World!");
}
```

If we don't have prism-rust in the project, lexical will strip all the info about the language and saved file will look like:

```
fn main() {
    println!("Hello World!");
}
```

That behavior seems to me like a bug.

Possible solution

I think CodeNode should always keep __language field, no matter what the mapToPrismLanguage() returns. And we can create another field called __isSyntaxHighlightSupported for highlighting check.

What do you think? I'll be happy to create another commit with a fix if provided solution works for the lexical team.

Description by Korbit AI

What change is being made?

Add unit tests to ensure that the code language is preserved in markdown conversion within the LexicalMarkdown package.

Why are these changes being made?

These changes are made to verify that the markdown conversion process correctly retains the specified code language, ensuring accurate syntax highlighting and language-specific formatting in the output. This addresses potential issues where the language might be lost or incorrectly handled during conversion.

[local-dev-korbit-ai-mentor]

Clone of the PR facebook/lexical#6259

[korbit-ai]

My review is in progress 📖 - I will have feedback for you in a few minutes!

[coderabbitai]

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[korbit-ai]

I have reviewed your code and did not find any issues!

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