[8.17] Removes tech preview label from cases connectors doc (#206351) (#206603)

# Backport

This will backport the following commits from `main` to `8.17`:
- [Removes tech preview label from cases connectors doc
(#206351)](https://github.com/elastic/kibana/pull/206351)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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BACKPORT-->

Co-authored-by: Janeen Mikell Roberts <57149392+jmikell821@users.noreply.github.com>

docs/management/connectors/action-types/cases-action-type.asciidoc

@@ -8,8 +8,6 @@
 :frontmatter-tags-content-type: [how-to] 
 :frontmatter-tags-user-goals: [configure]
 
-preview::[]
-
 The Cases connector creates cases in {kib} when alerts occur.
 
 [float]