[data views] remove toast display from data views service

[mattkime]

We'd like to remove error toasts from the data views service as the consuming APIs should be deciding the correct way to handle the errors. We should deprecate the current data views service methods that potentially display toasts and replace them with methods that pass errors. Its annoying to make mostly meaningless name changes to methods so we should consider tradeoffs.

a) Rename all toast displaying data view service methods - append 'Deprecated' to the names
b) Expose new methods with that throw errors instead of displaying them. Mark all Deprecated named methods as deprecated.
c) Provide wrapper that allows usage of new methods but toasts are being displayed by consumers. This is a way to address the technical debt and put off other UX changes.

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[kertal]

Closing this because it's not planned to be resolved in the foreseeable future. It will be tracked in our Icebox and will be re-opened if our priorities change. Feel free to re-open if you think it should be melted sooner.