dashboard: allow disabling of unused features

dashboard: allow disabling of unused features

Unconfigured dashboard features can lead to empty tabs in the dashboard
containing no meaningful content. Allow users to disable dashboard features
they know will not be used.

A list of features to be disabled allows the user to define a streamlined
dashboard as standard across deployments. Defaults to disabling no features,
ensuring that users are sure they do not need the dashboard feature before
disabling it.

Signed-off-by: Alex Lambert <lamberta@microsoft.com>