Unmute and fix testSubParserArray (#40626)

testSubParserArray failed, fixed and improved to not always have an
object as outer-level inside array.

Closes #40617

Author: henningandersen

libs/x-content/src/test/java/org/elasticsearch/common/xcontent/XContentParserTests.java

@@ -376,7 +376,7 @@ public void testSubParserArray() throws IOException {
         builder.startArray();
         int numberOfTokens = 0;
         for (int i = 0; i < numberOfArrayElements; ++i) {
-            numberOfTokens += generateRandomObjectForMarking(builder);
+            numberOfTokens += generateRandomObject(builder, 0);
         }
         builder.endArray();
         builder.endObject();
@@ -390,7 +390,7 @@ public void testSubParserArray() throws IOException {
             assertEquals(XContentParser.Token.START_ARRAY, parser.nextToken()); // [
             XContentParser subParser = new XContentSubParser(parser);
             try {
-                int tokensToSkip = randomInt(numberOfTokens - 1);
+                int tokensToSkip = randomInt(numberOfTokens);
                 for (int i = 0; i < tokensToSkip; i++) {
                     // Simulate incomplete parsing
                     assertNotNull(subParser.nextToken());