Export to CSV from a dashboard is not consistent with Discover CSV behavior

[AlonaNadler]

When you have a saved search without specifying any specific fields the export to CSV from the dashboard exports a CSV with only the date fields, I think it should behave the same as Discover - where no fields were added explicitly it export all fields to the CSV

Related to #33709

[elasticmachine]

Pinging @elastic/kibana-app

[tsullivan]

where no fields were added explicitly it export all fields to the CSV

This is a bit of a hidden feature, and currently requires a lot of logic on the front-end to support. The request to generate the report has to be modified on the fly to include every single field from the index pattern. It can easily create a HTTP request with a super large query string that has trouble working in certain infrastructures. I'm not really sure this is a good approach to begin with.

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServices)

[tsullivan]

This will be addressed when CSV Export uses SearchSource on the server internally. This is a priority since it is related to supporting Runtime Fields with CSV Export: #81079

[elasticmachine]

Pinging @elastic/kibana-reporting-services (Team:Reporting Services)

[tsullivan]

Duplicate of #68718