couchbase: Migrate couchbase partner package to different repo (#29239)

**Description:** Migrate the couchbase partner package to
[Couchbase-Ecosystem](https://github.com/Couchbase-Ecosystem/langchain-couchbase)
org

Author: nithishr

libs/packages.yml

@@ -259,8 +259,8 @@ packages:
   downloads: 35495
   downloads_updated_at: '2024-12-23T20:10:11.816059+00:00'
 - name: langchain-couchbase
-  path: libs/partners/couchbase
-  repo: langchain-ai/langchain
+  path: .
+  repo: Couchbase-Ecosystem/langchain-couchbase
   downloads: 347
   downloads_updated_at: '2024-12-23T20:10:11.816059+00:00'
 - name: langchain-ollama

libs/partners/couchbase/.gitignore

@@ -1,42 +1,3 @@
-# langchain-couchbase
+This package has moved!
 
-This package contains the LangChain integration with Couchbase
-
-## Installation
-
-```bash
-pip install -U langchain-couchbase
-```
-
-## Usage
-
-The `CouchbaseVectorStore` class exposes the connection to the Couchbase vector store.
-
-```python
-from langchain_couchbase.vectorstores import CouchbaseVectorStore
-
-from couchbase.cluster import Cluster
-from couchbase.auth import PasswordAuthenticator
-from couchbase.options import ClusterOptions
-from datetime import timedelta
-
-auth = PasswordAuthenticator(username, password)
-options = ClusterOptions(auth)
-connect_string = "couchbases://localhost"
-cluster = Cluster(connect_string, options)
-
-# Wait until the cluster is ready for use.
-cluster.wait_until_ready(timedelta(seconds=5))
-
-embeddings = OpenAIEmbeddings()
-
-vectorstore = CouchbaseVectorStore(
-    cluster=cluster,
-    bucket_name="",
-    scope_name="",
-    collection_name="",
-    embedding=embeddings,
-    index_name="vector-search-index",
-)
-
-```
+https://github.com/Couchbase-Ecosystem/langchain-couchbase/tree/main/langchain_couchbase