[ML] Transforms: Use data views service for loading data views

[peteharverson]

Part of #91715

There are a number of places where the Transform plugin is loading data views (index patterns) directly from the Saved Object API. This saved object usage should be replaced with the data views service.

See also #113961 for how this was achieved in the ml plugin.

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[mattkime]

I also found x-pack/plugins/data_visualizer/public/application/file_data_visualizer/components/import_view/import_view.js which I believe is also the responsibility of the ml team. It would be great to see these resolved in 8.3 as this one one of the remaining places where the data view saved object is being read directly.

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I found index-patterns being loaded in these files but there may be others -
x-pack/plugins/transform/public/app/hooks/use_search_items/common.ts
x-pack/plugins/transform/public/app/services/es_index_service.ts
x-pack/plugins/transform/server/routes/api/transforms.ts