parsed-literal environment does not respect leading whitespace

[nyoma-diamond]

What version of myst-parser are you using?

4.0.0

What version dependencies are you using?

sphinx==8.1.3
sphinx-argparse==0.5.2
sphinx_design==0.6.1
pydata-sphinx-theme==0.16.0
myst-parser==4.0.0
docutils==0.21.2

What operating system are you using?

Windows

Describe the Bug

When attempting to use the parsed-literal directive with MyST, leading whitespace isn't respected as it should be.

For example, attempting to display the following fails:

```{parsed-literal}
123
 23
  3
```

being incorrectly displayed as

123
23
3

This incorrect behavior only occurs with parsed-literal. code and code-block directives behave correctly. This breaks circumstances where parsed-literal is necessary for maintaining whitespace while allowing parseable behavior (e.g., for reference links).

Expected Behavior

Whitespace should be preserved, maintaining parity with reStructuredText. E.g., should be the same as

.. parsed-literal::
    
    123
     23
      3

which produces the following, as desired:

123
 23
  3

To Reproduce

1. Create a parsed-literal block containing lines with leading whitespace
2. Build the page
3. Observe the missing whitespace