Remove thumbnail generation from process

Closes #1715 (closed)

arkindex/process/migrations/0033_remove_process_generate_thumbnails.py

+# Generated by Django 4.1.7 on 2024-03-27 16:38
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("process", "0032_processdatasetset_model"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="process",
+            name="generate_thumbnails",
+        ),
+    ]