Fix test result ordering by test timestamps (#12533)

* Fix test result ordering by test timestamps

* Refractor test result comparison helper

* Apply formatting fixes

* Fix frontend formatting

* Avoid mutating test result records

* Add migration for test result ordering

* Retry documentation build

---------

Co-authored-by: jayasree723 <confidentlehmann@tomorjerry.com>
Co-authored-by: Oliver <oliver.henry.walters@gmail.com>

src/backend/InvenTree/stock/migrations/0127_alter_stockitemtestresult_options.py

@@ -0,0 +1,25 @@
+# Generated by Django 5.2.16
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("stock", "0126_serial_number_concurrency_guard"),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name="stockitemtestresult",
+            options={
+                "ordering": (
+                    "-finished_datetime",
+                    "-started_datetime",
+                    "-date",
+                    "-pk",
+                ),
+                "verbose_name": "Stock Item Test Result",
+            },
+        ),
+    ]

src/backend/InvenTree/stock/models.py

@@ -3820,6 +3820,8 @@ class StockItemTestResult(InvenTree.models.InvenTreeMetadataModel):
 
         verbose_name = _('Stock Item Test Result')
 
+        ordering = ('-finished_datetime', '-started_datetime', '-date', '-pk')
+
     def __str__(self):
         """Return string representation."""
         return f'{self.test_name} - {self.result}'