[VSA] Let users know data is aggregating

Background

With the new backend, we won't be able to show the default stages on the initial page load (group without persisted VSA stages) because at this point we don't have any aggregated data present. — #341739 (comment 805888371)

This won't affect groups with existing VSA stages.

How do we let users know that after 'activating' this feature there will be a delay before any data can be shown here?

Solution

Before	After - Standard	After - Toast
		View including toast after stream creation

Text

	Text
Alert title	Data is collecting and loading.
Alert body	‘value-stream-name’ is collecting the data. This can take a few minutes. If you have recently upgraded to premium, it can take up to 30 minutes for data to collect and display.
Alert button	Reload page
Toast	‘value-stream-name’ is collecting the data. This can take a few minutes.

Docs

• Add If you have recently upgraded to premium, it can take up to 30 minutes for data to collect and display. to create a value stream

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Original context (Archive)

Fo this we shouldn't display an empty state since a value stream exists - I think a warning on the page would suffice saying that job currently running. This is estimate to complete at: XXX or something similar #341739 (comment 833062108)

Will update this with the proposed solution.