[Automatic Import] Explicit instructions to generate the CSV columns

[ilyannn]

Context

When analyzing log sample, we currently also provide package and data stream's name and title to the LLM. This allows user to include some instructions to the LLM, e.g. as part of the title. These instructions, for example, the list of the columns from the documentation, greatly improve the resulting quality.

Action Items

We can advice the users about this feature, both as a message during the process as well as part of the documentation so that users know that they can provide information about the CSV format.

We can include the description which would be a better choice than a title.

We could also create a new field that only serves this specific purpose.

[elasticmachine]

Pinging @elastic/security-scalability (Team:Security-Scalability)