Remove tech preview designation from session invalidation API (#224076)

## Summary

Removes the tech preview designation from the session invalidation API.

Resolves https://github.com/elastic/kibana/issues/224070

## Release Note
The Session Invalidation API is now marked as Stable.

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

oas_docs/output/kibana.yaml

@@ -46955,7 +46955,6 @@ paths:
       summary: Invalidate user sessions
       tags:
         - user session
-      x-state: Technical Preview
   /api/short_url:
     post:
       description: |

x-pack/platform/plugins/shared/security/docs/openapi/user_session_apis.yaml

@@ -17,7 +17,6 @@ paths:
       summary: Invalidate user sessions
       tags:
         - user session
-      x-state: Technical Preview
       description: >
         Invalidate user sessions that match a query.
         To use this API, you must be a superuser.
@@ -82,7 +81,7 @@ paths:
               invalidateRequestExample2:
                 summary: Invalidate all SAML sessions
                 description: Run `POST api/security/session/_invalidate` to invalidate sessions that were created by any SAML authentication provider.
-                value: |-              
+                value: |-
                   {
                     "match" : "query",
                     "query": {