Remove hello/hello_standalone_activity.py in favor of top-level hello_standalone_activity/ sample

The standalone activity sample now lives in its own top-level directory
(added by Phil in fc08204). Update the test to import from the new
location and update both READMEs accordingly.

Author: dandavison

README.md

@@ -55,7 +55,6 @@ Some examples require extra dependencies. See each sample's directory for specif
   * [hello_search_attributes](hello/hello_search_attributes.py) - Start workflow with search attributes then change
     while running.
   * [hello_signal](hello/hello_signal.py) - Send signals to a workflow.
-  * [hello standalone activity](hello/hello_standalone_activity.py) - Execute an activity from outside of a workflow.
   * [hello update](hello/hello_update.py) - Send a request to and a response from a client to a workflow execution.
 <!-- Keep this list in alphabetical order -->
 * [activity_worker](activity_worker) - Use Python activities from a workflow in another language.
@@ -71,6 +70,7 @@ Some examples require extra dependencies. See each sample's directory for specif
 * [encryption](encryption) - Apply end-to-end encryption for all input/output.
 * [env_config](env_config) - Load client configuration from TOML files with programmatic overrides.
 * [gevent_async](gevent_async) - Combine gevent and Temporal.
+* [hello_standalone_activity](hello_standalone_activity) - Use activities without using a workflow.
 * [langchain](langchain) - Orchestrate workflows for LangChain.
 * [message_passing/introduction](message_passing/introduction/) - Introduction to queries, signals, and updates.
 * [message_passing/safe_message_handlers](message_passing/safe_message_handlers/) - Safely handling updates and signals.

hello/README.md

@@ -44,7 +44,6 @@ Replace `hello/hello_activity.py` in the command with any other example filename
 * [hello_search_attributes](hello_search_attributes.py) - Start workflow with search attributes then change while
   running.
 * [hello_signal](hello_signal.py) - Send signals to a workflow.
-* [hello standalone activity](hello_standalone_activity.py) - Execute an activity from outside of a workflow.
 * [hello_update](hello_update.py) - **Send a request to and a response from a client to a workflow execution.**
 
 Note: To enable the workflow update, set the `frontend.enableUpdateWorkflowExecution` dynamic config value to true.

hello/hello_standalone_activity.py

@@ -6,11 +6,13 @@
 from temporalio.client import Client
 from temporalio.worker import Worker
 
-from hello.hello_standalone_activity import ComposeGreetingInput, compose_greeting
+from hello_standalone_activity.my_activity import ComposeGreetingInput, compose_greeting
 
 
 async def test_execute_standalone_activity(client: Client):
-    pytest.skip("Standalone Activity is not yet supported by the CLI dev server")
+    pytest.skip(
+        "Standalone Activity is not yet supported by `temporal server start-dev`"
+    )
     task_queue_name = str(uuid.uuid4())
 
     async with Worker(