fix(api): fix incorrect path handling in Langfuse integration (#22766)

Co-authored-by: QuantumGhost <obelisk.reg+git@gmail.com>

api/tests/unit_tests/core/ops/test_config_entity.py

@@ -117,6 +117,13 @@ class TestLangfuseConfig:
         assert config.secret_key == "secret_key"
         assert config.host == "https://custom.langfuse.com"
 
+    def test_valid_config_with_path(self):
+        host = host = "https://custom.langfuse.com/api/v1"
+        config = LangfuseConfig(public_key="public_key", secret_key="secret_key", host=host)
+        assert config.public_key == "public_key"
+        assert config.secret_key == "secret_key"
+        assert config.host == host
+
     def test_default_values(self):
         """Test default values are set correctly"""
         config = LangfuseConfig(public_key="public", secret_key="secret")