Remove thumbnail generation from process

Closes #1715 (closed)

arkindex/process/migrations/0033_merge_20240327_1500.py

+# Generated by Django 4.1.7 on 2024-03-27 15:00
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("process", "0032_processdatasetset_model"),
+        ("process", "0032_remove_process_generate_thumbnails"),
+    ]
+
+    operations = [
+    ]