Refs #20566: Change fixed_size_string namespace from fastrtps to fastcdr

Signed-off-by: elianalf <62831776+elianalf@users.noreply.github.com>

Author: elianalf

src/main/java/com/eprosima/fastdds/idl/parser/typecode/StringTypeCode.java

@@ -65,7 +65,7 @@ public String getCppTypename()
     {
         if (Kind.KIND_STRING == getKind() && isIsBounded() && ctx instanceof com.eprosima.fastcdr.idl.context.Context && ((com.eprosima.fastcdr.idl.context.Context)ctx).isCdrv1TemplatesEnabled())
         {
-            return "eprosima::fastrtps::fixed_string<" + getMaxsize() + ">";
+            return "eprosima::fastcdr::fixed_string<" + getMaxsize() + ">";
         }
 
         return super.getCppTypename();

src/main/java/com/eprosima/fastdds/idl/templates/SerializationSource.stg

@@ -1051,11 +1051,8 @@ external_suffix(p, external) ::= <<$p$$if(external)$->$else$.$endif$>>
 cppTypenameBetweenCdrVersions(typecode) ::= <<
 $if(typecode.isStringType && typecode.isBounded)$
 $! Avoid error with namespace when generated fixed_string depending on CDR version !$
-#if FASTCDR_VERSION_MAJOR == 1
-eprosima::fastrtps::fixed_string<$typecode.maxsize$>
-#else
 eprosima::fastcdr::fixed_string<$typecode.maxsize$>
-#endif
+
 
 $else$
 $typecode.cppTypename$