Remove thumbnail generation from process

Closes #1715 (closed)

arkindex/documents/fixtures/data.json

@@ -381,14 +381,14 @@
 },
 {
     "model": "process.workerrun",
-    "pk": "527f297e-25be-4cf0-a557-f2679d605c14",
+    "pk": "561ff70e-282b-4ef0-9405-065658bee696",
     "fields": {
-        "process": "9f2362e7-9e74-431a-8c5f-7a54a43fd5a8",
-        "version": "e14c27a7-2525-42e8-8aea-2f9c8b38c708",
+        "process": "de1be14d-6a0c-4229-8d45-886c03cd8781",
+        "version": "51d03bd9-0ca8-40fd-a231-f03ad9d301c6",
         "model_version": null,
-        "parents": "[\"75dc71dd-4eb2-45d3-bbb6-ad05bf7f252e\"]",
+        "parents": "[]",
         "configuration": null,
-        "summary": "Worker Recognizer @ e14c27",
+        "summary": "Worker Custom worker @ version 1",
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
         "has_results": false
@@ -396,14 +396,14 @@
 },
 {
     "model": "process.workerrun",
-    "pk": "561ff70e-282b-4ef0-9405-065658bee696",
+    "pk": "75dc71dd-4eb2-45d3-bbb6-ad05bf7f252e",
     "fields": {
-        "process": "de1be14d-6a0c-4229-8d45-886c03cd8781",
-        "version": "51d03bd9-0ca8-40fd-a231-f03ad9d301c6",
+        "process": "9f2362e7-9e74-431a-8c5f-7a54a43fd5a8",
+        "version": "89cdf4f7-efe9-4387-91cc-fc7aa9bac2f7",
         "model_version": null,
         "parents": "[]",
         "configuration": null,
-        "summary": "Worker Custom worker @ version 1",
+        "summary": "Worker Document layout analyser @ 89cdf4",
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
         "has_results": false
@@ -411,14 +411,14 @@
 },
 {
     "model": "process.workerrun",
-    "pk": "75dc71dd-4eb2-45d3-bbb6-ad05bf7f252e",
+    "pk": "527f297e-25be-4cf0-a557-f2679d605c14",
     "fields": {
         "process": "9f2362e7-9e74-431a-8c5f-7a54a43fd5a8",
-        "version": "89cdf4f7-efe9-4387-91cc-fc7aa9bac2f7",
+        "version": "e14c27a7-2525-42e8-8aea-2f9c8b38c708",
         "model_version": null,
-        "parents": "[]",
+        "parents": "[\"75dc71dd-4eb2-45d3-bbb6-ad05bf7f252e\"]",
         "configuration": null,
-        "summary": "Worker Document layout analyser @ 89cdf4",
+        "summary": "Worker Recognizer @ e14c27",
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
         "has_results": false