[CI] Sync acceptance test OS matrix with JDK matrix pipeline (#18739) (#18743)

(cherry picked from commit 74a2bbf)

Co-authored-by: Álex Cámara Lara <alex.camara@elastic.co>

Author: mergify[bot]

.buildkite/scripts/exhaustive-tests/generate-steps.py

@@ -10,7 +10,16 @@
 VM_IMAGES_FILE = ".buildkite/scripts/common/vm-images.json"
 VM_IMAGE_PREFIX = "platform-ingest-logstash-multi-jdk-"
 
-ACCEPTANCE_LINUX_OSES = ["ubuntu-2404", "ubuntu-2204", "ubuntu-2004", "debian-11", "debian-12", "debian-13", "rhel-8", "oraclelinux-7", "rocky-linux-8", "opensuse-leap-15", "amazonlinux-2023"]
+ACCEPTANCE_LINUX_OSES = [
+    "ubuntu-2404", "ubuntu-2204", "ubuntu-2004",
+    "debian-11", "debian-12", "debian-13",
+    "rhel-8", "rhel-9",
+    "oraclelinux-7", "oraclelinux-8",
+    "rocky-linux-8", "rocky-linux-9",
+    "almalinux-8", "almalinux-9",
+    "opensuse-leap-15",
+    "amazonlinux-2023",
+]
 
 CUR_PATH = os.path.dirname(os.path.abspath(__file__))