[Lens] audit errors and warnings

[drewdaemon]

Describe the feature:
#147485 provided a new set of patterns for showing errors and warnings in Lens. All existing errors and warnings should be audited WRT these new patterns.

Example questions to ask

• Is this classified correctly (should an error be a warning instead)?
• Is this message showing up in the right place (e.g. should it be associated with a particular dimension)?
• Is there a way to keep users away from this state in the first place?
• Does it really make sense to block the render in this state?
• Is this correctly using the UserMessages system (technical question)?

[elasticmachine]

Pinging @elastic/kibana-visualizations (Team:Visualizations)

[drewdaemon]

Another error to take a look at: #93998