[ML] Job list displays error toast if index is missing for data view

[pheyos]

Found in version

• 7.16.0

Browser

• Chrome

Steps to reproduce

• Create a data view and then remove the corresponding index
• Navigate to the anomaly detection job list or to the data frame analytics job list

Expected result

• The job list loads without issues

Actual result

• An error toast is displayed - sometimes multiple times per data view, which can be very annoying
  

Additional information

• This only happens on first load, after that things seem to be cached
• According to a slack discussion with @jgowdyelastic this might have been fixed in 8.0 already

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[jgowdyelastic]

This error is coming from the data view service, it is caused by how we were loading all data views on page load.
The data view service attempts to load all fields for all requested data views, and if an index no longer exists, this error is displayed.
ML's data view loading was changed for 8.0.0 by this PR

I do not believe we need to fix this for 7.17 as the workaround is to remove the matching data view for the missing index, which is something the user should be doing anyway.