Unimplemented abstract method in sleep workload

[alexmanle]

Describe the Bug

Running the sleep workload in standalone mode results in a type error due to an unimplemented abstract method.

Trace:

  File "cloudai/src/cloudai/_core/base_runner.py", line 111, in submit_test
    job = self._submit_test(tr)
  File "cloudai/src/cloudai/systems/standalone/standalone_runner.py", line 41, in _submit_test
    exec_cmd = self.get_cmd_gen_strategy(self.system, tr).gen_exec_command()
  File "cloudai/src/cloudai/_core/base_runner.py", line 380, in get_cmd_gen_strategy
    return strategy_cls(system, test_run)
TypeError: Can't instantiate abstract class SleepStandaloneCommandGenStrategy with abstract method store_test_run

Steps to Reproduce

Utilized CloudAI, version 1.4b26.dev1+g9650abed.d20251114
Python 3.10.12

1. Configure CloudAI to use the sleep test scenario.
2. Execute in dry-run or run mode.

Command:

cloudai run \
    --system-config conf/common/system/standalone_system.toml \
    --tests-dir conf/common/test \
    --test-scenario conf/common/test_scenario/sleep.toml

Expected Behavior

Should result in proper run through of the test.