## Summary

Followup for elastic#182918.
Compressed content and switched to load `.ndjson.gz`directly

(cherry picked from commit 67bedde)

#208255)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Attack discovery] Optimize attack discovery test data
(#206885)](#206885)

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

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

<!--BACKPORT [{"author":{"name":"Patryk
Kopyciński","email":"contact@patrykkopycinski.com"},"sourceCommit":{"committedDate":"2025-01-24T18:15:07Z","message":"[Attack
discovery] Optimize attack discovery test data (#206885)\n\n##
Summary\r\n\r\nFollowup for
#182918. \r\nCompressed content
and switched to load
`.ndjson.gz`directly","sha":"67bedde849b502ee366b341ae66a19eb03f71ac3","branchLabelMapping":{"^v9.0.0$":"main","^v8.18.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","v9.0.0","Feature:Security
Assistant","Team:Security Generative
AI","backport:version","v8.18.0"],"title":"[Attack discovery] Optimize
attack discovery test
data","number":206885,"url":"https://github.com/elastic/kibana/pull/206885","mergeCommit":{"message":"[Attack
discovery] Optimize attack discovery test data (#206885)\n\n##
Summary\r\n\r\nFollowup for
#182918. \r\nCompressed content
and switched to load
`.ndjson.gz`directly","sha":"67bedde849b502ee366b341ae66a19eb03f71ac3"}},"sourceBranch":"main","suggestedTargetBranches":["8.x"],"targetPullRequestStates":[{"branch":"main","label":"v9.0.0","branchLabelMappingKey":"^v9.0.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/206885","number":206885,"mergeCommit":{"message":"[Attack
discovery] Optimize attack discovery test data (#206885)\n\n##
Summary\r\n\r\nFollowup for
#182918. \r\nCompressed content
and switched to load
`.ndjson.gz`directly","sha":"67bedde849b502ee366b341ae66a19eb03f71ac3"}},{"branch":"8.x","label":"v8.18.0","branchLabelMappingKey":"^v8.18.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Patryk Kopyciński <contact@patrykkopycinski.com>

## Summary

Followup for elastic#182918. 
Compressed content and switched to load `.ndjson.gz`directly