fix sleep engine for dp=1

[RunningLeon]

Motivation

fix sleep engine for dp=1

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit tests to ensure the correctness.
3. If the modification has a dependency on downstream projects of a newer version, this PR should be tested with all supported versions of downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[Copilot]

Pull request overview

This PR fixes the sleep engine functionality when data parallelism (dp) is set to 1 by making synchronization event operations conditional on having multiple data parallel processes.

Changes:

• Added conditional checks for dp > 1 before awaiting/setting synchronization events in sleep/wakeup methods

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