Graph client side app migration

[flash1293]

Preparation

The Graph app is using a few legacy helpers that have to be migrated before the app itself can move.

• Confirm modals Remove confirm modal directive and factory #56846
• Saved object helpers Move saved objects helper to new platform #56954
• Configs Migrate vega and graph configs to new platform #57011
• src/legacy/ui/public/notify/app_redirect - should be moved into kibana_legacy
• export { createTopNavDirective, createTopNavHelper } from 'ui/kbn_top_nav/kbn_top_nav'; - should be moved into kibana_legacy

Move

The whole app should be moved from the legacy x-pack folder to the NP x-pack folder. App registration should happen using the NP APIs.

Things that can't be migrated right now should be left behind in the legacy plugin:

• Saved object mappings
• Saved object migrations
• xpack feature registration
• Config definition (once Migrate vega and graph configs to new platform #57011 is merged they are not used anymore but still have to remain in place to pass the validation)

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)