[Security Solution] Add security-engineering-productivity ownership for Security Solution Scout-related code (elastic#245361)

## Summary

Adds `@elastic/security-engineering-productivity` as a code owner for
Security Solution Scout-related code to improve onboarding and ensure
best practices during the initial adoption phase.

## Changes

- Added `@elastic/security-engineering-productivity` as a code owner for
`x-pack/solutions/security/packages/kbn-scout-security` (alongside
existing `@elastic/appex-qa` ownership)
- Added code ownership for
`/x-pack/solutions/security/plugins/security_solution/test/scout`
directory

## Motivation

These ownership updates will:
- Improve onboarding by ensuring the Security Engineering Productivity
team is notified of Scout-related changes
- Help maintain best practices through consistent review and guidance
during the initial adoption period
- Provide teams with support and mentorship as they learn the new tool
and testing patterns

## Note on Test Ownership

The ownership of the Scout test directory is intended to be
**temporary**. Once all teams have a solid understanding of best
practices and are comfortable with the new tool, we plan to transfer
ownership back to the respective feature teams. This temporary ownership
structure ensures consistent quality and knowledge transfer during the
transition period.

---------

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

Author: 2 people

.github/CODEOWNERS

@@ -1191,7 +1191,7 @@ x-pack/solutions/security/packages/index-adapter @elastic/security-threat-huntin
 x-pack/solutions/security/packages/kbn-cloud-security-posture/common @elastic/contextual-security-apps
 x-pack/solutions/security/packages/kbn-cloud-security-posture/graph @elastic/contextual-security-apps
 x-pack/solutions/security/packages/kbn-cloud-security-posture/public @elastic/contextual-security-apps
-x-pack/solutions/security/packages/kbn-scout-security @elastic/appex-qa
+x-pack/solutions/security/packages/kbn-scout-security @elastic/appex-qa @elastic/security-engineering-productivity
 x-pack/solutions/security/packages/kbn-securitysolution-autocomplete @elastic/security-detection-engine
 x-pack/solutions/security/packages/kbn-securitysolution-endpoint-exceptions-common @elastic/security-detection-engine
 x-pack/solutions/security/packages/kbn-securitysolution-exception-list-components @elastic/security-detection-engine
@@ -2531,6 +2531,7 @@ x-pack/solutions/security/test/security_solution_api_integration/test_suites/sou
 /x-pack/solutions/security/test/security_solution_cypress/es_archives @elastic/security-engineering-productivity
 /x-pack/solutions/security/test/security_solution_playwright @elastic/security-engineering-productivity
 /x-pack/solutions/security/plugins/security_solution/scripts/run_cypress @patrykkopycinski @maximpn @banderror
+/x-pack/solutions/security/plugins/security_solution/test/scout @elastic/security-engineering-productivity
 
 ## Security Solution sub teams - Cloud Security Posture
 

x-pack/solutions/security/packages/kbn-scout-security/kibana.jsonc

@@ -1,7 +1,10 @@
 {
   "type": "test-helper",
   "id": "@kbn/scout-security",
-  "owner": "@elastic/appex-qa",
+  "owner": [
+    "@elastic/appex-qa",
+    "@elastic/security-engineering-productivity"
+  ],
   "group": "security",
   "visibility": "private",
   "devOnly": true