Refactor update creation api

This merge request does the following:

• Raise DRF errors rather than returning response to take advantage of the DRF exception handling mechanism
• Create serialisers for PUT request to simplify the code
• Improve validation checks in several places
• Fixes several issues in DRF infrastructure uses
• Fixes JSON fields handling
• Remove routes that do no fully qualify objects
• Implement a custom DRF exception handler that will allow to log errors
• Improve testing
• Improve permission management

beat/web/experiments/serializers.py

@@ -35,12 +35,10 @@ from rest_framework import serializers
 
 from django.contrib.humanize.templatetags.humanize import naturaltime
 
-from django.db.models import CharField, Value as V
-from django.db.models.functions import Concat
-
 from ..common.serializers import ShareableSerializer
 from ..common.fields import JSONSerializerField
 from ..common.utils import validate_restructuredtext
+from ..common.utils import annotate_full_name
 from ..common.exceptions import ContributionCreationError
 
 from ..ui.templatetags.markup import restructuredtext
@@ -73,16 +71,7 @@ class ExperimentCreationSerializer(serializers.ModelSerializer):
 
     def toolchain_queryset(self):
         user = self.context.get("user")
-        return Toolchain.objects.for_user(user, True).annotate(
-            full_name=Concat(
-                "author__username",
-                V("/"),
-                "name",
-                V("/"),
-                "version",
-                output_field=CharField(),
-            )
-        )
+        return annotate_full_name(Toolchain).for_user(user, True)
 
     def validate_name(self, name):
         # sanitize_name is a static method of Versionable models but Experiment