[docs-beta] support path prefix for tutorial snippets (#26792)

## Summary & Motivation

- Adds support for `pathPrefix` in `CodeExample` component

This allows us to use examples that are outside of the
`docs_beta_snippets` folder, for example, `examples/tutorial_pinecone`.

Tutorial was updated to demonstrate how this can be used:

```
<CodeExample
  pathPrefix="tutorial_pinecone/tutorial_pinecone"
  filePath="assets.py" 
  lineStart="22"
  lineEnd ="60"
  />
```

## How I Tested These Changes

```
yarn dev
```

## Changelog

NOCHANGELOG

---------

Co-authored-by: Dennis Hume <[email protected]>

docs/docs-beta/src/components/CodeExample.tsx

@@ -7,8 +7,10 @@ interface CodeExampleProps {
   title?: string;
   lineStart?: number;
   lineEnd?: number;
+  pathPrefix?: string;
 }
 
+
 /**
  * Removes content below the `if __name__` block for the given `lines`.
  */
@@ -28,20 +30,18 @@ function filterNoqaComments(lines: string[]): string[] {
 
 const CodeExample: React.FC<CodeExampleProps> = ({
   filePath,
-  language,
   title,
   lineStart,
   lineEnd,
+  language = 'python',
+  pathPrefix = 'docs_beta_snippets/docs_beta_snippets',
   ...props
 }) => {
   const [content, setContent] = React.useState<string>('');
   const [error, setError] = React.useState<string | null>(null);
 
-  language = language || 'python';
-
   React.useEffect(() => {
-    // Adjust the import path to start from the docs directory
-    import(`!!raw-loader!/../../examples/docs_beta_snippets/docs_beta_snippets/${filePath}`)
+    import(`!!raw-loader!/../../examples/${pathPrefix}/${filePath}`)
       .then((module) => {
         var lines = module.default.split('\n');