fixed Bug in PreFilter of AzureCosmosDBNoSqlVectorSearch (#29613)

Description: Fixes PreFilter value handling in Azure Cosmos DB NoSQL
vectorstore. The current implementation fails to handle numeric values
in filter conditions, causing an undefined value variable error. This PR
adds support for numeric, boolean, and NULL values while maintaining the
existing string and list handling.

Changes:
Added handling for numeric types (int/float)
Added boolean value support
Added NULL value handling
Added type validation for unsupported values
Fixed scope of value variable initialization

Issue: 
Fixes #29610

Implementation Notes:
No changes to public API
Backwards compatible
Maintains consistent behavior with existing MongoDB-style filtering
Preserves SQL injection prevention through proper value handling

---------

Co-authored-by: Chester Curme <chester.curme@gmail.com>

libs/community/langchain_community/vectorstores/azure_cosmos_db_no_sql.py

@@ -789,6 +789,13 @@ class AzureCosmosDBNoSqlVectorSearch(VectorStore):
                 elif isinstance(condition.value, list):
                     # e.g., for IN clauses
                     value = f"({', '.join(map(str, condition.value))})"
+                elif isinstance(condition.value, (int, float, bool)):
+                    value = str(condition.value)
+                elif condition.value is None:
+                    value = "NULL"
+                else:
+                    raise ValueError(f"Unsupported value type: {type(condition.value)}")
+
                 clauses.append(f"c.{condition.property} {sql_operator} {value}")
         return f""" WHERE {' {} '.format(sql_logical_operator).join(clauses)}""".strip()