Add 2 flaky retries to es snapshot jobs (#64553) (#65134)

.ci/es-snapshots/Jenkinsfile_verify_es

@@ -21,6 +21,7 @@ def SNAPSHOT_MANIFEST = "https://storage.googleapis.com/kibana-ci-es-snapshots-d
 
 kibanaPipeline(timeoutMinutes: 135) {
   catchErrors {
+    retryable.enable(2)
     withEnv(["ES_SNAPSHOT_MANIFEST=${SNAPSHOT_MANIFEST}"]) {
       parallel([
         'kibana-intake-agent': workers.intake('kibana-intake', './test/scripts/jenkins_unit.sh'),

vars/prChanges.groovy

@@ -7,6 +7,7 @@ def getSkippablePaths() {
     /^docs\//,
     /^rfcs\//,
     /^.ci\/.+\.yml$/,
+    /^.ci\/es-snapshots\//,
     /^\.github\//,
     /\.md$/,
   ]