Run stable Java 26 as default JVM (#10613)

Run stable Java 26 as default JVM

Remove print line

Add comment about stable

Co-authored-by: sarah.chen <sarah.chen@datadoghq.com>

Author: sarahchen6

.gitlab-ci.yml

@@ -31,7 +31,7 @@ variables:
   GRADLE_PLUGIN_PROXY: "https://depot-read-api-java.us1.ddbuild.io/magicmirror/magicmirror/@current/"
   BUILDER_IMAGE_VERSION_PREFIX: "v26.01-" # use either an empty string (e.g. "") for latest images or a version followed by a hyphen (e.g. "v25.05-")
   REPO_NOTIFICATION_CHANNEL: "#apm-java-escalations"
-  DEFAULT_TEST_JVMS: /^(8|11|17|21|25)$/ # the latest "stable" version is LTS v25
+  DEFAULT_TEST_JVMS: /^(8|11|17|21|25|stable)$/ # the latest "stable" version is 26
   PROFILE_TESTS:
     description: "Enable profiling of tests"
     value: "false"
@@ -62,15 +62,14 @@ workflow:
       - "17"
       - "21"
       - "25"
-      - "26"
       - "semeru11"
       - "oracle8"
       - "zulu8"
       - "semeru8"
       - "ibm8"
       - "zulu11"
       - "semeru17"
-      # - "stable"
+      - "stable"
     CI_SPLIT: ["1/1"]
 
 # Gitlab doesn't support "parallel" and "parallel:matrix" at the same time