Streamline the backend logging

Closes #880 (closed)

• Multiple commands now use Django's command output and error facilities, removing many loggers.
• All calls to logging.basicConfig have been removed, letting Django's settings alone handle the logging configuration without being overriden.
• A few loggers that were defined in modules but not used at all have been removed.
• The S3FileMixin logs for instances that do not have S3 objects (such as elements that should not have thumbnails) are now marked as debug to avoid polluting the production logs.
• The permission check failure logs are now marked as debug to avoid polluting the production logs (we already see HTTP 400/401/403 anyway).
• The Transkribus credentials error log has been removed (we already have a HTTP 400).
• The logging configuration now ensures that all django.*, arkindex.*, rq.* loggers are set to INFO.
• arkindex rqworker does show the logs for every job now!

arkindex/dataimport/management/commands/fake_worker_version.py

 #!/usr/bin/env python3
-import logging
 import uuid
 
-from django.core.management.base import BaseCommand
+from django.core.management.base import BaseCommand, CommandError
 
 from arkindex.dataimport.models import Repository, RepositoryType, Revision, Worker, WorkerVersion
 
-logging.basicConfig(
-    level=logging.INFO,
-    format='[%(levelname)s] %(message)s',
-)
-logger = logging.getLogger(__name__)
-
 
 class Command(BaseCommand):
     help = 'Create a fake worker version'
@@ -37,7 +30,7 @@ class Command(BaseCommand):
         versions = WorkerVersion.objects.filter(worker__slug=slug)
         if versions.exists():
             versions_id = list(versions.values_list('id', flat=True).distinct())
-            logger.info(f"This worker already has versions: {versions_id}")
+            raise CommandError(f"This worker already has versions: {versions_id}")
             return
 
         repo, _ = Repository.objects.get_or_create(
@@ -68,4 +61,4 @@ class Command(BaseCommand):
             configuration={"configuration": {}},
         )
 
-        logger.info(f"Created a worker version: {version.id}")
+        self.stdout.write(self.style.SUCCESS(f"Created a worker version: {version.id}"))