[SECURITY][ResponseOps][Cases][8.19] Note about new case analytics indices

[nastasha-solomon]

❗❗❗ DO NOT MERGE - WAS PULLED FROM RELEASE ❗❗❗

⚠️ NOTE: Must be merged after elastic/kibana#229041. ⚠️

Contributes to elastic/docs-content#1716 by adding note letting users know that it's possible to to visualize data from cases in your space. Also added a limitations section and updated it so it matches what's included in other case docs.

Corresponding 9.1 docs:

• Feature docs: [ResponseOps][Cases][9.1 & Serverless] New case analytics indices feature docs docs-content#2220
• Schema: [DOCS][ResponseOps][Cases][9.1 & Serverless] Case analytics indices schema kibana#229036

Preview:

• Cases

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[nastasha-solomon]

The CI checks for this PR will fail until elastic/kibana#229041 is merged.

[nastasha-solomon]

Not being released in 8.x.