fix(submissions): avoid adding XML declaration when rewriting submiss…

…ion XML and creating asset snapshot (#5439)

### 📣 Summary
The clean_duplicated_submissions command has been updated to save XML
files without the declaration.


### 📖 Description
This update modifies the behavior of the clean_duplicated_submissions
command to save XML files without including the declaration. This change
ensures cleaner XML outputs by removing unnecessary declaration headers,
making it easier to work with the files programmatically.

kobo/apps/openrosa/apps/logger/tests/test_set_meta_function.py

@@ -0,0 +1,40 @@
+from django.test import TestCase
+from kobo.apps.openrosa.apps.logger.xform_instance_parser import set_meta
+
+
+class TestSetMetaFunction(TestCase):
+    def test_set_meta_updates_xml_correctly(self):
+        """
+        Test that the set_meta() does not add an XML declaration
+        """
+        xml_input = """
+        <data>
+            <meta>
+                <instanceID>uuid:original-id</instanceID>
+            </meta>
+            <question1>Answer1</question1>
+        </data>
+        """
+        updated_xml = set_meta(
+            xml_input, 'instanceID', 'uuid:new-id'
+        )
+
+        # Ensure XML declaration is not added
+        self.assertNotIn("<?xml version='1.0' ?>", updated_xml)
+
+        # Ensure the instanceID is updated
+        self.assertIn('<instanceID>uuid:new-id</instanceID>', updated_xml)
+
+    def test_set_meta_raises_error_for_missing_node(self):
+        xml_input = """
+        <data>
+            <meta>
+                <otherID>uuid:other-id</otherID>
+            </meta>
+            <question1>Answer1</question1>
+        </data>
+        """
+        with self.assertRaises(ValueError) as context:
+            set_meta(xml_input, 'instanceID', 'uuid:new-id')
+
+        self.assertEqual(str(context.exception), 'instanceID node not found')

kobo/apps/openrosa/apps/logger/xform_instance_parser.py

@@ -135,7 +135,9 @@ def set_meta(xml_str: str, meta_name: str, new_value: str) -> str:
     if node.firstChild:
         node.firstChild.nodeValue = new_value
 
-    return root.toxml()
+    xml_output = root.toprettyxml(indent='  ')
+    xml_output = xml_output.replace('<?xml version="1.0" ?>', '').strip()
+    return xml_output
 
 
 def _xml_node_to_dict(node: Node, repeats: list = []) -> dict: