fix(form-validate): context-aware Check 12 — ExternalDataProcessorObject is error in config

Detect config vs EPF context by walking up from FormPath looking for
Configuration.xml. ExternalDataProcessorObject/ExternalReportObject are
valid in EPF/ERF but cause XDTO exception in configuration context.

- EPF forms: no warning (ExternalDataProcessorObject is correct)
- Config forms: ERROR with hint to use DataProcessorObject/ReportObject
- Fix test DSLs: compiled-form, table-form used wrong External* type

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/skills/cases/form-validate/compiled-form.json

@@ -23,7 +23,7 @@
           { "button": "Выполнить", "command": "Выполнить" }
         ],
         "attributes": [
-          { "name": "Объект", "type": "ExternalDataProcessorObject.Валидация", "main": true },
+          { "name": "Объект", "type": "DataProcessorObject.Валидация", "main": true },
           { "name": "Поле1", "type": "string" },
           { "name": "Поле2", "type": "decimal(15,2)" },
           { "name": "Флаг", "type": "boolean" }

tests/skills/cases/form-validate/snapshots/compiled-form/DataProcessors/Валидация/Forms/Форма/Ext/Form.xml

@@ -40,7 +40,7 @@
 	<Attributes>
 		<Attribute name="Объект" id="14">
 			<Type>
-				<v8:Type>cfg:ExternalDataProcessorObject.Валидация</v8:Type>
+				<v8:Type>cfg:DataProcessorObject.Валидация</v8:Type>
 			</Type>
 			<MainAttribute>true</MainAttribute>
 		</Attribute>

tests/skills/cases/form-validate/snapshots/table-form/DataProcessors/ВалТабл/Forms/Форма/Ext/Form.xml

@@ -35,7 +35,7 @@
 	<Attributes>
 		<Attribute name="Объект" id="13">
 			<Type>
-				<v8:Type>cfg:ExternalDataProcessorObject.ВалТабл</v8:Type>
+				<v8:Type>cfg:DataProcessorObject.ВалТабл</v8:Type>
 			</Type>
 			<MainAttribute>true</MainAttribute>
 		</Attribute>

tests/skills/cases/form-validate/table-form.json

@@ -21,7 +21,7 @@
           ]}
         ],
         "attributes": [
-          { "name": "Объект", "type": "ExternalDataProcessorObject.ВалТабл", "main": true },
+          { "name": "Объект", "type": "DataProcessorObject.ВалТабл", "main": true },
           { "name": "Данные", "type": "ValueTable", "columns": [
             { "name": "Наименование", "type": "string(150)" },
             { "name": "Количество", "type": "decimal(10,3)" }