Multi-goroutine backup/restore

[Hysteria23]

problem/challenge

The current BackupWithResolvers function in Velero processes backup items sequentially. This serial processing can be a performance bottleneck, especially for large Kubernetes clusters with many resources. It results in longer backup times, which can impact the overall efficiency and reliability of backup operations in large-scale environments.

Solution proposal

Modify the BackupWithResolvers function to process backup items concurrently using goroutines. This will involve:

1. Creating a worker pool to manage the concurrent processing of backup items.
2. Using channels to communicate between the main backup loop and the worker goroutines.

Environment:

• Velero version (use velero version): v1.14.0
• Kubernetes version (use kubectl version): v1.29
• Kubernetes installer & version: kubeadm 1.29
• Cloud provider: AWS,Azure,GCP
• OS: Ubuntu 20.04

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[Lyndon-Li]

#7628 this design will cover this requirement

[kaovilai]

Close as dupe of #7900 ?