deprecation warning for privacy-plugin options

Signed-off-by: Sally MacFarlane <macfarla.github@gmail.com>

besu/src/main/java/org/hyperledger/besu/cli/BesuCommand.java

@@ -1311,6 +1311,8 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
     // after start has been called on plugins
 
     if (Boolean.TRUE.equals(privacyOptionGroup.isPrivacyEnabled)) {
+      logger.warn(
+          "--Xprivacy-plugin-enabled and related options are " + PRIVACY_DEPRECATION_PREFIX);
 
       if (privacyOptionGroup.privateMarkerTransactionSigningKeyPath != null
           && privacyPluginService != null

besu/src/main/java/org/hyperledger/besu/cli/options/PrivacyPluginOptions.java

@@ -33,7 +33,7 @@ public class PrivacyPluginOptions {
   @Option(
       names = "--Xprivacy-plugin-enabled",
       description =
-          "Enables the use of a plugin to implement your own privacy strategy (default: ${DEFAULT-VALUE})",
+          "Deprecated. Tessera-based privacy is deprecated. See CHANGELOG for alternative options. Enables the use of a plugin to implement your own privacy strategy (default: ${DEFAULT-VALUE})",
       hidden = true)
   private final Boolean isPrivacyPluginEnabled = false;