Package the JDK into jdk.app on macOS (#48765)

This commit packages the bundled JDK into jdk.app on macOS to assist
with notarization there.

distribution/archives/build.gradle

@@ -61,8 +61,14 @@ CopySpec archiveFiles(CopySpec modulesFiles, String distributionType, String pla
         with binFiles(distributionType, oss, jdk)
       }
       if (jdk) {
-        into('jdk') {
-          with jdkFiles(project, platform)
+        if ("darwin".equals(platform)) {
+          into('jdk.app') {
+            with jdkFiles(project, platform)
+          }
+        } else {
+          into('jdk') {
+            with jdkFiles(project, platform)
+          }
         }
       }
       into('') {

distribution/src/bin/elasticsearch-env

@@ -41,8 +41,8 @@ if [ ! -z "$JAVA_HOME" ]; then
   JAVA_TYPE="JAVA_HOME"
 else
   if [ "$(uname -s)" = "Darwin" ]; then
-    # OSX has a different structure
-    JAVA="$ES_HOME/jdk/Contents/Home/bin/java"
+    # macOS has a different structure
+    JAVA="$ES_HOME/jdk.app/Contents/Home/bin/java"
   else
     JAVA="$ES_HOME/jdk/bin/java"
   fi