Remove getAutodetectMode() in MBeanExporter

After further consideration, the team has decided to remove the
getAutodetectMode() method since its return type conflicts with the
parameter type in setAutodetectMode(int), making it an invalid bean
property.

See gh-30855

spring-context/src/main/java/org/springframework/jmx/export/MBeanExporter.java

@@ -153,7 +153,7 @@ public class MBeanExporter extends MBeanRegistrationSupport implements MBeanExpo
 
 	/** The autodetect mode to use for this MBeanExporter. */
 	@Nullable
-	private Integer autodetectMode;
+	Integer autodetectMode;
 
 	/** Whether to eagerly initialize candidate beans when autodetecting MBeans. */
 	private boolean allowEagerInit = false;
@@ -263,19 +263,6 @@ public class MBeanExporter extends MBeanRegistrationSupport implements MBeanExpo
 		this.autodetectMode = autodetectMode;
 	}
 
-	/**
-	 * Get the autodetect mode to use for this {@code MBeanExporter}.
-	 * @return the configured autodetect mode, or {@code null} if not explicitly
-	 * configured
-	 * @since 6.0.11
-	 * @see #setAutodetectModeName(String)
-	 * @see #setAutodetectMode(int)
-	 */
-	@Nullable
-	public Integer getAutodetectMode() {
-		return this.autodetectMode;
-	}
-
 	/**
 	 * Specify whether to allow eager initialization of candidate beans
 	 * when autodetecting MBeans in the Spring application context.