PublishContext support cancellation but this is not visible to User

[MichaelPetrinolis]

Describe the bug

When you add a handler that cancels Publish/Unpublish of a content item the user gets a success confirmation

Orchard Core version

2.x

To Reproduce

1. Add a handler to cancel publish/unpublish context.
2. Execute Publish/Unpuiblish Action
3. User gets a success confirmation although the action was canceled

Expected behavior

User should get an error that the action was not completed

[github-actions]

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