Persist generated public keys unencrypted (#34626)

The changes introduced in cca1a2a mean that we should
not encrypt the public keys that might be generated by
the key-pair-generator when storing the file, as the code 
that would consume them assumes that they are not encrypted

Author: hanbing0715

x-pack/license-tools/src/main/java/org/elasticsearch/license/licensor/tools/KeyPairGeneratorTool.java

@@ -21,7 +21,6 @@
 import java.security.SecureRandom;
 
 import static org.elasticsearch.license.CryptUtils.writeEncryptedPrivateKey;
-import static org.elasticsearch.license.CryptUtils.writeEncryptedPublicKey;
 
 public class KeyPairGeneratorTool extends LoggingAwareCommand {
 
@@ -65,7 +64,7 @@ protected void execute(Terminal terminal, OptionSet options) throws Exception {
         KeyPair keyPair = keyGen.generateKeyPair();
 
         Files.write(privateKeyPath, writeEncryptedPrivateKey(keyPair.getPrivate()));
-        Files.write(publicKeyPath, writeEncryptedPublicKey(keyPair.getPublic()));
+        Files.write(publicKeyPath, keyPair.getPublic().getEncoded());
 
         terminal.println(
                 Terminal.Verbosity.VERBOSE,