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/integration/utils.py

@@ -7,6 +7,7 @@ import requests
 from astrapy.admin import parse_api_endpoint
 from langflow.api.v1.schemas import InputValueRequest
 from langflow.custom import Component
+from langflow.custom.eval import eval_custom_component_code
 from langflow.field_typing import Embeddings
 from langflow.graph import Graph
 from langflow.processing.process import run_graph_internal
@@ -105,6 +106,16 @@ def download_flow_from_github(name: str, version: str) -> JSONFlow:
     return JSONFlow(json=as_json)
 
 
+def download_component_from_github(module: str, file_name: str, version: str) -> Component:
+    version_string = f"v{version}" if version != "main" else version
+    response = requests.get(
+        f"https://raw.githubusercontent.com/langflow-ai/langflow/{version_string}/src/backend/base/langflow/components/{module}/{file_name}.py",
+        timeout=10,
+    )
+    response.raise_for_status()
+    return Component(_code=response.text)
+
+
 async def run_json_flow(
     json_flow: JSONFlow, run_input: Any | None = None, session_id: str | None = None
 ) -> dict[str, Any]:
@@ -170,3 +181,9 @@ async def run_single_component(
         graph, flow_id, session_id=session_id, inputs=graph_run_inputs, outputs=[component_id]
     )
     return graph.get_vertex(component_id).built_object
+
+
+def build_component_instance_for_tests(version: str, file_name: str, **kwargs):
+    component = download_component_from_github("prompts", file_name, version)
+    cc_class = eval_custom_component_code(component._code)
+    return cc_class(**kwargs)