Add the ability to mark a visualization as confidential to disable sharing

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Problem to solve

As part of Allow users to download/share/embed a chart pan... (&8940) we want to give users the ability to disable the sharing actions introduced in Add "Share image with URL" action to dashboard ... (#460471) and Add download image action to dashboard panels (#460470).

Proposed solution

Add the ability to mark a visualization as private / confidential. When true this would disable the sharing actions.

We could consider simply adding this as an optional field to visualization configurations.

Implementation plan

🚧 TBD