fix: Make from_template_and_variables async for backwards compatibility, add sync version, add tests and small fixes (#4500)

* Refactor `trace_name` property to use `_id` instead of `_vertex.id` for component identification

* Handle missing session_id attribute in component and agent classes

* Add SUPPORTED_VERSIONS constant for version tracking in tests

* Add utility to download components from GitHub in integration tests

* Rename TestComponent to ComponentForTesting to avoid conflict with pytest

* test: enhance PromptComponent tests for version support

Add parameterized testing for supported versions and a validation for the latest PromptComponent. This improves test coverage and ensures compatibility across different versions.

* refactor: move build_component_instance_for_tests utility to integration utils

* Make `from_template_and_variables` async for backwards compatibility and add sync version

* Refactor `PromptComponent` to use `Message.from_template` method across starter projects JSON files.

* add await to `from_template_and_variables` call

* Add async test for message prompt serialization and update cache directory handling

- Introduced `async` in `test_message_prompt_serialization` for asynchronous message creation.
- Added `test_message_sync_prompt_serialization` for synchronous message testing.
- Updated cache directory paths to "langflow_test" for test isolation.
- Utilized `monkeypatch` to set environment variable for cache directory in `langflow_cache_dir` fixture.

* Add fixture and existence check in test_schema_message.py

- Use `langflow_cache_dir` fixture in `test_message_with_single_image`.
- Add assertion to verify the existence of `second_image`.

* Add base test class to ensure file names are defined for all supported versions

* Remove default value for 'file_name' parameter in 'build_component_instance_for_tests' function

* Enhance `TestPromptComponent` with version-specific file name handling and base class integration

* Refactor test_prompt_component_versions to use FILE_NAMES_MAPPING directly

* Add component version tests and base classes for testing with/without client

* Simplify `build_component_instance_for_tests` by returning `cc_class` directly

* Refactor `TestPromptComponent` to use `ComponentTestBaseWithClient` and remove version tests

* Add assertion for LANGFLOW_CONFIG_DIR in test_message_with_multiple_images

* Refactor: update method call to `from_template` in `langchain_hub.py`

* Handle missing '_id' attribute in 'trace_name' method of custom_component.py

* Optimize `get_and_cache_all_types_dict` call by removing unnecessary thread usage in test.

src/backend/tests/base.py

@@ -0,0 +1,39 @@
+from typing import Any
+
+import pytest
+
+from tests.constants import SUPPORTED_VERSIONS
+from tests.integration.utils import build_component_instance_for_tests
+
+# Sentinel value to mark undefined test cases
+DID_NOT_EXIST = object()
+
+
+class ComponentTestBase:
+    component_class = None
+    DEFAULT_KWARGS: dict[str, Any] = {}
+    FILE_NAMES_MAPPING: dict[str, object | str] = {}
+
+    def test_all_versions_have_a_file_name_defined(self):
+        for version in SUPPORTED_VERSIONS:
+            assert version in self.FILE_NAMES_MAPPING
+            assert self.FILE_NAMES_MAPPING[version] is not None
+
+    def test_component_versions(self):
+        """Test if the component works across different versions."""
+        for version, file_name in self.FILE_NAMES_MAPPING.items():
+            if file_name is DID_NOT_EXIST:
+                continue
+
+            instance = build_component_instance_for_tests(version, file_name=file_name, **self.DEFAULT_KWARGS)
+            result = instance()
+            assert result is not None, f"{self.component_class.__name__} failed to execute in version {version}"
+
+
+@pytest.mark.usefixtures("client")
+class ComponentTestBaseWithClient:
+    pass
+
+
+class ComponentTestBaseWithoutClient:
+    pass