Remove the deprecated HelperAttributes conversion methods

The four methods delegated to Attribute, which declares them with the same
signatures. The remaining call sites, all in TestHelperAttributes, now call
Attribute directly.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: CesarCoelho

apis/api-area001-v003-mal/src/main/java/org/ccsds/moims/mo/mal/helpertools/helpers/HelperAttributes.java

@@ -42,30 +42,6 @@ public class HelperAttributes {
      */
     public static String SERIAL_OBJECT_STRING = "SerializedObject";
 
-    /**
-     * Converts an {@link Attribute} into a Java Double.
-     *
-     * @param in the Attribute to convert
-     * @return the converted Double value
-     * @deprecated Use {@link Attribute#attribute2double(Attribute)} directly.
-     */
-    @Deprecated
-    public static Double attribute2double(Attribute in) {
-        return Attribute.attribute2double(in);
-    }
-
-    /**
-     * Converts a value into its String representation.
-     *
-     * @param in the value to convert
-     * @return the String representation
-     * @deprecated Use {@link Attribute#attribute2string(Object)} directly.
-     */
-    @Deprecated
-    public static String attribute2string(Object in) {
-        return Attribute.attribute2string(in);
-    }
-
     /**
      * Creates an instance of a MAL attribute from attribute name
      *
@@ -266,30 +242,6 @@ public static Object string2attribute(Object in, String value)
         return null;
     }
 
-    /**
-     * Converts a Java type into an MO {@link Attribute}.
-     *
-     * @param obj the Java object to convert
-     * @return the resulting Attribute
-     * @deprecated Use {@link Attribute#javaType2Attribute(Object)} directly.
-     */
-    @Deprecated
-    public static Object javaType2Attribute(Object obj) {
-        return Attribute.javaType2Attribute(obj);
-    }
-
-    /**
-     * Converts a MAL data type into a Java data type
-     *
-     * @param obj The object in the MAL data type
-     * @return The object in the Java data type
-     * @deprecated Use {@link Attribute#attribute2JavaType(Object)} directly.
-     */
-    @Deprecated
-    public static Object attribute2JavaType(Object obj) {
-        return Attribute.attribute2JavaType(obj);
-    }
-
     /**
      * Generates the correct Element List based on the Java type
      *