langchain: Copy libs/standard-tests folder when building devcontainer (#24470)

### Description

* Fix `libs/langchain/dev.Dockerfile` file. copy the
`libs/standard-tests` folder when building the devcontainer.
* `poetry install --no-interaction --no-ansi --with dev,test,docs`
command requires this folder, but it was not copied.

### Reference

#### Error message when building the devcontainer from the master branch

```
...

[2024-07-20T14:27:34.779Z] ------
 > [langchain langchain-dev-dependencies 7/7] RUN poetry install --no-interaction --no-ansi --with dev,test,docs:
0.409 
0.409 Directory ../standard-tests does not exist
------

...
```

#### After the fix

Build success at vscode:

<img width="866" alt="image"
src="https://github.com/user-attachments/assets/10db1b50-6fcf-4dfe-83e1-d93c96aa2317">
This commit is contained in:
남광우 2024-07-22 22:46:38 +09:00 committed by GitHub
parent 37b89fb7fc
commit 7ab82eb8cc
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@ -56,5 +56,8 @@ COPY libs/text-splitters/ ../text-splitters/
# Copy the partners library for installation
COPY libs/partners ../partners/
# Copy the standard-tests library for installation
COPY libs/standard-tests ../standard-tests/
# Install the Poetry dependencies (this layer will be cached as long as the dependencies don't change)
RUN poetry install --no-interaction --no-ansi --with dev,test,docs