refactor: Convert VFolder deletion from blocking response to event-driven pattern

[fregataa]

resolves #3060

As is

sequenceDiagram
    participant Client
    participant Manager
    participant StorageProxy
    participant FileSystem


    Client->>Manager: Request VFolder deletion
    Manager->>Manager: Update VFolder status to "DELETE-ONGOING"
    Manager->>Client: Response
    activate Manager
    Note right of Manager: Spawn async task
    Manager->>StorageProxy: HTTP Request
    StorageProxy->>FileSystem: Delete tree
    Note over StorageProxy,FileSystem: Long term job
    FileSystem->>StorageProxy: Finish
    StorageProxy->>Manager: HTTP 204 Response
    alt Deletion Success
        Manager->>Manager: Update VFolder status to "DELETE-COMPLETE"
    else
        Manager->>Manager: Update VFolder status to "DELETE-ERROR"
    end
    deactivate Manager

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To do

sequenceDiagram
    participant Client
    participant Manager
    participant StorageProxy
    participant FileSystem
    participant EventBus


    Client->>Manager: Request VFolder deletion
    Manager->>Manager: Update VFolder status to "DELETE-ONGOING"
    Manager->>StorageProxy: HTTP Request
    
    opt VFolder not found
        StorageProxy->>Manager: HTTP 404 Response
        Manager->>Manager: Update VFolder status to "DELETE-COMPLETE"
        Manager->>Client: Response
    end
    
    activate StorageProxy
    Note right of StorageProxy: Spawn async task
    StorageProxy->>Manager: HTTP 202 Response
    Manager->>Client: Response
    StorageProxy->>FileSystem: Delete tree
    Note over StorageProxy,FileSystem: Long term job
    FileSystem->>StorageProxy: Finish
    StorageProxy-->> EventBus: Publish deletion-finish event
    deactivate StorageProxy

    EventBus-->>Manager: Consume deletion-finish event
    alt Deletion Success
        Manager->>Manager: Update VFolder status to "DELETE-COMPLETE"
    else
        Manager->>Manager: Update VFolder status to "DELETE-ERROR"
    end

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Checklist: (if applicable)

• Milestone metadata specifying the target backport version
• Mention to the original issue
• API server-client counterparts (e.g., manager API -> client SDK)

[fregataa]

• refactor: Convert VFolder deletion from blocking response to event-driven pattern #3063 👈
• chore: Add VFolderID string deserializer function #3062
• fix: Change vfolder name when deleted to allow reusing the name #3061
• main

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