Migrate Status Page UI

[joshdover]

Related to #41983

We want to migrate the UI before the server-side in order to cut off legacy UI plugins sooner.

This UI should be migrated to the NP status_page plugin and can continue to use the legacy status API for the time being.

[elasticmachine]

Pinging @elastic/kibana-platform (Team:Platform)

[joshdover]

@pgayvallet I think it would make sense to move this UI into src/core/public/core_app since it really should not be a plugin anymore. It's absolutely part of Core and should always be present.

[pgayvallet]

@joshdover Fine with that. I guess that means that the associated http API shall be moved to core too (when we'll do it)?

EDIT: that also means that we should get rid of src/plugins/status_page ? It's currently only used for

kibana/src/plugins/status_page/public/plugin.ts

Lines 24 to 30 in 38c17d6

	const isStatusPageAnonymous = core.injectedMetadata.getInjectedVar(
	'isStatusPageAnonymous'
	) as boolean;
	if (isStatusPageAnonymous) {
	core.http.anonymousPaths.register('/status');
	}

[joshdover]

@joshdover Fine with that. I guess that means that the associated http API shall be moved to core too (when we'll do it)?

EDIT: that also means that we should get rid of src/plugins/status_page ? It's currently only used for

Yes and yes.