Put License API can return HTTP 500

License.fromXContent used to throw ElasticsearchException.
ExceptionsHelper.status mapped that to HTTP 500.

License.fromXContent now throws ElasticsearchParseException.
ExceptionsHelper.status maps that to HTTP 400.

Added LicenseIT.testPutInvalidTrialLicense to test with
truncated license signature.

Closes elastic#74058

client/rest-high-level/src/test/java/org/elasticsearch/client/LicenseIT.java

@@ -9,7 +9,6 @@
 package org.elasticsearch.client;
 
 import org.elasticsearch.Build;
-import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.ElasticsearchStatusException;
 import org.elasticsearch.action.support.master.AcknowledgedResponse;
 import org.elasticsearch.client.license.DeleteLicenseRequest;
@@ -31,7 +30,6 @@
 import org.junit.BeforeClass;
 
 import java.io.IOException;
-import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -40,7 +38,6 @@
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.CoreMatchers.notNullValue;
 import static org.hamcrest.CoreMatchers.nullValue;
-import static org.hamcrest.CoreMatchers.startsWith;
 import static org.hamcrest.Matchers.empty;
 import static org.hamcrest.Matchers.emptyOrNullString;
 import static org.hamcrest.Matchers.not;