PublicDashboards: Refresh ds plugin supported list

[juanicabanas]

What is this feature?

After this PR, some datasources don't work and need some modifications. This can be checked here

This PR updates the documentation and the alert shown in the public dashboard modal when an unsupported datasource plugin is being used in the dashboard

Why do we need this feature?

[Add a description of the problem the feature is trying to solve.]

Who is this feature for?

[Add information on what kind of user the feature is for.]

Which issue(s) does this PR fix?:

Fixes #74945

Special notes for your reviewer:

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.

[evictorero]

Left some comments. We can leverage this PR to run the script on publicdashboards.go and commit the updated list.

[juanicabanas]

Left some comments. We can leverage this PR to run the script on publicdashboards.go and commit the updated list.

The backend-generated list hasn't changed, because there's no way to know if a ds extends from DataSourceWithBackend or calls super.query from a backend layer. That's why I was forced to change it in the frontend method.

[evictorero]

Left some comments. We can leverage this PR to run the script on publicdashboards.go and commit the updated list.

The backend-generated list hasn't changed, because there's no way to know if a ds extends from DataSourceWithBackend or calls super.query from a backend layer. That's why I was forced to change it in the frontend method.

I know but if you run it you will find some changes, I was wondering if we can add those changes in this PR as well.