[Time to visualize] Add guidance to help users understand the new workflow

[rayafratkina]

Describe the feature:
When we are ready to switch to embed-by-value approach to including visualizations in the dashboard, we need to provide guidance to the end user in the UI to help explain the transition.

Describe a specific use case for the feature:
Details TBD, but I imagine 3-pronged approach

On Visualize library page,

• add a callout to explain the new workflow
• give user the ability to dismiss this callout
• possibly take advantage of EUItour component to offer a walkthrough

On Dashboard page,

• add a Tour highlighting the new add functionality and explaining the flow

On Edit dashboard page

• add a callout to explain the new add/edit flow

cc @AlonaNadler @ryankeairns @majagrubic @ThomThomson

[elasticmachine]

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

[rayafratkina]

Actually, it's a duplicate - Alona already created an issue #66445