When a Markdown file contains a YAML block in a bullet point, comments do not have the right syntax highlighting

[mtkennerly]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.78.2
• OS Version: Windows 11

Steps to Reproduce:

1. Create a Markdown file with this content:

# Baseline
```yaml
# foo
```

# Indented
  ```yaml
  # foo
  ```

# Bullet point
* ```yaml
  # foo
  ```

2. Notice that the comment in the bullet point is not highlighted like the others:

   

[mjbvz]

@alexr00 I believe the root cause is that the yaml grammar uses ^ for most of it's rules. To handle cases where it is embedded, we should use (^|\G) instead