Data store background fix

[jasquat]

Addresses https://github.com/sartography/spiff-arena/issues/1359#issuecomment-2077274788

This adds a method to KKVDataStore that adds the getter back onto tasks when they run. This is due to the script engine removing methods from the task data when it serializes. These getters are added to the tasks when the task is marked READY and therefore may not be there when we actually run the task.

[coderabbitai[bot]]

Walkthrough

The updates primarily enhance the SpiffWorkflow backend's functionality and robustness. Key changes include the introduction of a process_instance_id parameter in execution and import scripts, improvements in data handling through the KKVDataStore, and method enhancements in service classes to support better task and process instance management. Additionally, there's a focus on refining data migration scripts and expanding unit tests to cover new functionalities.

Changes

File Path	Change Summary
.../execute_tasks_for_process_instance.py & .../import_process_instance_from_bpmn_json.py	Added process_instance_id parameter handling in main functions.
.../old_proc.json	Added a BPMN workflow definition for a message send process.
.../data_migrations/version_4.py	Removed unused return None statement in run method.
.../data_stores/kkv.py & .../services/workflow_execution_service.py	Major updates to KKVDataStore, including method restructuring and integration into workflow execution.
.../services/process_instance_service.py	Enhanced run_process_instance_with_processor and updated complete_form_task to include data dumping.
.../tests/data/data_store_simple/data-store-simple.bpmn	Defined a simple BPMN process with various workflow elements.
.../tests/.../test_kkv_data_store.py	Expanded unit tests with new methods and additional module imports.

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