monorepo: add script for updating notebook cassettes (#27399)

1. Move dependencies for running notebooks into monorepo poetry test
deps;
2. Add script to update cassettes for a single notebook;
3. Add cassettes for some how-to guides.

---

To update cassettes for a single notebook, run
`docs/scripts/update_cassettes.sh`. For example:
```
./docs/scripts/update_cassettes.sh docs/docs/how_to/binding.ipynb
```
Requires:
1. monorepo dev and test dependencies installed;
2. env vars required by notebook are set.

Note: How-to guides are not currently run in [scheduled
job](https://github.com/langchain-ai/langchain/actions/workflows/run_notebooks.yml).
Will add cassettes for more how-to guides in subsequent PRs before
adding them to scheduled job.

docs/scripts/prepare_notebooks_for_ci.py

@@ -122,7 +122,10 @@ def add_vcr_to_notebook(
     return notebook
 
 
-def process_notebooks(should_comment_install_cells: bool) -> None:
+def process_notebooks(
+    should_comment_install_cells: bool,
+    working_directory: str,
+) -> None:
     for directory in NOTEBOOK_DIRS:
         for root, _, files in os.walk(directory):
             for file in files:
@@ -130,6 +133,12 @@ def process_notebooks(should_comment_install_cells: bool) -> None:
                     continue
 
                 notebook_path = os.path.join(root, file)
+                # Filter notebooks based on the working_directory input
+                if working_directory != "all" and not notebook_path.startswith(
+                    working_directory
+                ):
+                    continue
+
                 try:
                     notebook = nbformat.read(notebook_path, as_version=4)
 
@@ -172,8 +181,16 @@ def process_notebooks(should_comment_install_cells: bool) -> None:
     default=False,
     help="Whether to comment out install cells",
 )
-def main(comment_install_cells):
-    process_notebooks(should_comment_install_cells=comment_install_cells)
+@click.option(
+    "--working-directory",
+    default="all",
+    help="Working directory or specific notebook to process",
+)
+def main(comment_install_cells, working_directory):
+    process_notebooks(
+        should_comment_install_cells=comment_install_cells,
+        working_directory=working_directory,
+    )
     logger.info("All notebooks processed successfully.")