Unmute Kerberos integ tests (elastic#80538)

We used to default enctypes to des3-cbc-sha1-kd but with JDK17, weak
encryption types are disabled by default. This caused our Kerberos
integration tests to fail with an `sun.security.krb5.KrbException: no
supported default etypes for default_tkt_enctypes` exception. We have
since changed our default encryption type to aes256-cts-hmac-sha1-96 in
elastic#78703 and we can unmute these tests now.

Author: jkakavas

x-pack/qa/kerberos-tests/src/test/java/org/elasticsearch/xpack/security/authc/kerberos/KerberosAuthenticationIT.java

@@ -97,10 +97,6 @@ public void setupRoleMapping() throws IOException {
     }
 
     public void testLoginByKeytab() throws IOException, PrivilegedActionException {
-        assumeFalse(
-            "This test fails often on Java 17 early access. See: https://github.com/elastic/elasticsearch/issues/72120",
-            "17".equals(System.getProperty("java.version"))
-        );
         final String userPrincipalName = System.getProperty(TEST_USER_WITH_KEYTAB_KEY);
         final String keytabPath = System.getProperty(TEST_USER_WITH_KEYTAB_PATH_KEY);
         final boolean enabledDebugLogs = Boolean.parseBoolean(System.getProperty(ENABLE_KERBEROS_DEBUG_LOGS_KEY));
@@ -113,10 +109,6 @@ public void testLoginByKeytab() throws IOException, PrivilegedActionException {
     }
 
     public void testLoginByUsernamePassword() throws IOException, PrivilegedActionException {
-        assumeFalse(
-            "This test fails often on Java 17 early access. See: https://github.com/elastic/elasticsearch/issues/72120",
-            "17".equals(System.getProperty("java.version"))
-        );
         final String userPrincipalName = System.getProperty(TEST_USER_WITH_PWD_KEY);
         final String password = System.getProperty(TEST_USER_WITH_PWD_PASSWD_KEY);
         final boolean enabledDebugLogs = Boolean.parseBoolean(System.getProperty(ENABLE_KERBEROS_DEBUG_LOGS_KEY));
@@ -129,10 +121,6 @@ public void testLoginByUsernamePassword() throws IOException, PrivilegedActionEx
     }
 
     public void testGetOauth2TokenInExchangeForKerberosTickets() throws PrivilegedActionException, GSSException, IOException {
-        assumeFalse(
-            "This test fails often on Java 17. See: https://github.com/elastic/elasticsearch/issues/72120",
-            "17".equals(System.getProperty("java.version"))
-        );
         final String userPrincipalName = System.getProperty(TEST_USER_WITH_PWD_KEY);
         final String password = System.getProperty(TEST_USER_WITH_PWD_PASSWD_KEY);
         final boolean enabledDebugLogs = Boolean.parseBoolean(System.getProperty(ENABLE_KERBEROS_DEBUG_LOGS_KEY));