Revert "Add Java 22 to testing matrix"

This reverts commit e39f00f.

Author: mark-vieira

.buildkite/pipelines/periodic.template.yml

@@ -67,14 +67,6 @@ steps:
               - openjdk18
               - openjdk19
               - openjdk20
-              - openjdk21
-              - openjdk22
-            GRADLE_TASK:
-              - checkPart1
-              - checkPart2
-              - checkPart3
-              - bwcTestSnapshots
-              - checkRestCompat
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004
@@ -167,7 +159,7 @@ steps:
       image: family/elasticsearch-ubuntu-2004
       machineType: n2-standard-8
       buildDirectory: /dev/shm/bk
-    if: build.branch == "main" || build.branch == "7.17"
+    if: build.branch == "main" || build.branch =~ /^[0-9]+\.[0-9]+\$/
   - label: Check branch consistency
     command: .ci/scripts/run-gradle.sh branchConsistency
     timeout_in_minutes: 15

.buildkite/pipelines/periodic.yml

@@ -1278,14 +1278,6 @@ steps:
               - openjdk18
               - openjdk19
               - openjdk20
-              - openjdk21
-              - openjdk22
-            GRADLE_TASK:
-              - checkPart1
-              - checkPart2
-              - checkPart3
-              - bwcTestSnapshots
-              - checkRestCompat
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004