[Security Solution] Reenabling Cypress burn (#163965)

Co-authored-by: Patryk Kopyciński <[email protected]>
Co-authored-by: Kibana Machine <[email protected]>

.buildkite/pipelines/pull_request/security_solution.yml

@@ -11,4 +11,15 @@ steps:
         - exit_status: '*'
           limit: 1
     artifact_paths:
-      - "target/kibana-security-solution/**/*"
+      - "target/kibana-security-solution/**/*"
+
+  - command: .buildkite/scripts/steps/functional/security_solution_burn.sh
+    label: 'Security Solution Cypress tests, burning changed specs'
+    agents:
+      queue: n2-4-spot
+    depends_on: build
+    timeout_in_minutes: 120
+    parallelism: 1
+    soft_fail: true
+    artifact_paths:
+      - "target/kibana-security-solution/**/*"