Disable sticky sessions for backend service (#8659)

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Updated service configuration for CVAT, removing sticky cookie
settings.
	- Added default storage configuration for KVrocks with 100Gi size.
- Enhanced database authentication clarity with explicit username and
database fields.

- **Bug Fixes**
	- Adjusted Redis architecture to explicitly set to standalone.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Roman Donchenko <roman@cvat.ai>

changelog.d/20241107_162818_andrey_disable_traefik_sticky_sessions.md

@@ -0,0 +1,4 @@
+### Changed
+
+- \[Helm\] Traefik sticky sessions for the backend service are disabled
+  (<https://github.com/cvat-ai/cvat/pull/8659>)

helm-chart/values.yaml

@@ -134,8 +134,7 @@ cvat:
     permissionFix:
       enabled: true
     service:
-      annotations:
-        traefik.ingress.kubernetes.io/service.sticky.cookie: "true"
+      annotations: {}
       spec:
         type: ClusterIP
         ports: