[security][9.0] Creates Automatic Migrations guide

[benironside]

Addresses the 9.0 component of #586 by creating a new guide for the AI-powered SIEM migrations feature.

Previews: Automatic Migration (new page)

[Charelzard]

Ben this looks great! Let me know once the images are updated and I'll rereview. Im thinking we do a video or gif for a full walkthrough, thoughts?

My feedback is as follows.

• Instead of referencing the tool tip for the types of statuses we should list them all for installed, translated partial, etc.
• I updated the RBAC documenation section to include a sentence and screen shot.
• @bojanasan Sent over an update in Figma for Partially translated which could be explained further in the docs for how a user can get a rule to a green state. There are three main areas:

1. User needs to define an index pattern when editing.
2. A macro or lookup is not defined
3. Its an actual syntax error.

I think we could either put this in the doc or within the text of the page. Let me know what would be better here.

[Charelzard]

See all requested updates. I do think we might need a video or gif to show the whole process beginning to end but If you think the process clearly describes how to navigate the entire process we can defer to the current docs. For some reason the existing pages dont show the images yet.

[Charelzard]

I dont see the Overview tab or summary tabs along with the index information. FYI @benironside

[Charelzard]

@benironside Please update Step 2 to this:

Elastic ships with a default LLM, if you prefer to change the default model under Configure AI provider select a model, or add a new one. For information on how different models perform, refer to the LLM performance matrix.

[nastasha-solomon]

This is really cool - great job, @benironside! I left some suggestions and minor edits throughout. Feel free to ping me once you've gone through and made the changes that you want.