[Workspace] Allow duplicate selected/all objects on saved object management page among different workspaces

[yubonluo]

Is your feature request related to a problem? Please describe.

With workspace feature enabled, in the saved object management page, we should allow users to duplicate selected/all saved objects in one workspace to another, the duplicated saved objects are new saved objects in the target workspace, not reference.

Describe the solution you'd like

1. Firstly, we need to implement a new copy/duplicate API which can be called by the UI. The API has been implemented in the PR: [Workspace] Add duplicate saved objects API #6288
2. Secondly, add all the UI change of this functionality.

Additional context

Here is mockup about this UI:

Additional context

#4944