docs: Added WatsonxRerank documentation (#27424)

Thank you for contributing to LangChain!

Changes:
- docs: Added `WatsonxRerank` documentation 
- docs Updated `WatsonxEmbeddings` with docs template
- docs: Updated `ChatWatsonx` with docs template
- docs: Updated `WatsonxLLM` with docs template
- docs: Added `ChatWatsonx` to list with Chat models providers. Added
[test_chat_models_standard](https://github.com/langchain-ai/langchain-ibm/blob/main/libs/ibm/tests/integration_tests/test_chat_models_standard.py)
to `langchain_ibm` tests suite.
- docs: Added `IBM` to list with Embedding models providers. Added
[test_embeddings_standard](https://github.com/langchain-ai/langchain-ibm/blob/main/libs/ibm/tests/integration_tests/test_embeddings_standard.py)
to `langchain_ibm` tests suite.
- docs: Updated `langcahin_ibm` recommended versions compatible with
`LangChain v0.3`

---------

Co-authored-by: Erick Friis <erick@langchain.dev>

docs/scripts/partner_pkg_table.py

@@ -63,6 +63,7 @@ JS_PACKAGES = {
     "nomic",
     "google-common",
     "ollama",
+    "ibm",
 }
 
 
@@ -76,6 +77,7 @@ CUSTOM_NAME = {
     "google-genai": "Google Generative AI",
     "aws": "AWS",
     "airbyte": "Airbyte",
+    "ibm": "IBM",
 }
 CUSTOM_PROVIDER_PAGES = {
     "azure-dynamic-sessions": "/docs/integrations/providers/microsoft/",