community[patch]: add delete() method to AzureSearch vector store (#21127)

**Issue:**
Currently `AzureSearch` vector store does not implement `delete` method.
This PR implements it. This also makes it compatible with LangChain
indexer.

**Dependencies:**
None

**Twitter handle:**
@martintriska1

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

libs/community/tests/unit_tests/vectorstores/test_indexing_docs.py

@@ -16,7 +16,7 @@ def test_compatible_vectorstore_documentation() -> None:
     case and 1) update docs in [1] and 2) update the `documented`
     dict in this test case.
 
-    [1] langchain/docs/docs_skeleton/docs/modules/data_connection/indexing.ipynb
+    [1] langchain/docs/docs/modules/data_connection/indexing.ipynb
     """
 
     # Check if a vectorstore is compatible with the indexing API
@@ -49,6 +49,7 @@ def test_compatible_vectorstore_documentation() -> None:
         "AnalyticDB",
         "AstraDB",
         "AzureCosmosDBVectorSearch",
+        "AzureSearch",
         "AwaDB",
         "Bagel",
         "BESVectorStore",