Support `enableTaskIDBasedBlobDigest` for preheat job in Manager

[gaius-qi]

Feature request:

Support enableTaskIDBasedBlobDigest for preheat job in Manager.

Now client.download_task gRPC API has supported enableTaskIDBasedBlobDigest, refer to https://github.com/dragonflyoss/api/blob/main/proto/common.proto#L653. Manager REST API needs add enableTaskIDBasedBlobDigest field for preheating job, and set enableTaskIDBasedBlobDigest to call client.download_task gRPC API.

For the Manager's REST API, the default value of enableTaskIDBasedBlobDigest should be true, and the frontend Console can set it when creating or querying preheat jobs.

Refer to dragonflyoss/client#1499.

[dask-58]

Hi! I've implemented this feature and opened a PR.
Summary of changes:

• Added enable_task_id_based_blob_digest field to PreheatArgs in Manager REST API
• Propagated the field through internal job types to scheduler
• Set the field in scheduler's DownloadTask gRPC call to dfdaemon
• Default value is true as specified in the request
• Added unit tests for the helper function

Happy to address any feedback

[gaius-qi]

@dask-58 Assign to you.