RHOAIENG-48052: Scheduled sessions (#864)

Introduce scheduled sessions that let users create cron-based schedules
for automatically launching agentic sessions. The feature spans all
layers of the platform:

Backend: CRUD handlers for scheduled sessions backed by Kubernetes
CronJobs, with suspend/resume, manual trigger, and run-history
endpoints. Auth checks delegate to the user's token while CronJob
operations use the backend service account.

Operator: session-trigger subcommand that runs inside CronJob-spawned
pods, reads a session template from env vars, and creates an
AgenticSession CR. ProjectSettings reconciler ensures per-namespace
RBAC (ServiceAccount, Role, RoleBinding) for the trigger SA.

Frontend: Schedules tab in the project workspace, create dialog with
cron presets and expression preview, detail page with run history,
Next.js API route proxies, React Query hooks, and TypeScript types.

Manifests: Backend ClusterRole gains CronJob and Job/create permissions,
operator ClusterRole gains AgenticSession/create, backend deployment
reads OPERATOR_IMAGE and IMAGE_PULL_POLICY from operator-config
ConfigMap, Vertex AI config keys made optional to avoid clobbering.

Includes unit tests for backend helpers (sanitizeLabelValue,
cronJobToScheduledSession), operator trigger (sanitizeName), operator
RBAC (ensureSessionTriggerRBAC), frontend query hooks, and cron utils.

---------

Signed-off-by: Martin Prpič <mprpic@redhat.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: mprpic

Makefile

@@ -780,6 +780,14 @@ kind-rebuild: check-kind check-kubectl check-local-context build-all ## Rebuild,
 	@kubectl rollout restart deployment -n $(NAMESPACE) $(QUIET_REDIRECT)
 	@kubectl rollout status deployment -n $(NAMESPACE) --timeout=120s $(QUIET_REDIRECT)
 	@echo "$(COLOR_GREEN)✓$(COLOR_RESET) All components rebuilt and restarted"
+	@# Re-apply Vertex AI setup if requested (kind-rebuild re-applies manifests which resets ConfigMap)
+	@if [ "$(LOCAL_VERTEX)" = "true" ]; then \
+		echo "$(COLOR_BLUE)▶$(COLOR_RESET) Re-configuring Vertex AI..."; \
+		ANTHROPIC_VERTEX_PROJECT_ID="$(ANTHROPIC_VERTEX_PROJECT_ID)" \
+		CLOUD_ML_REGION="$(CLOUD_ML_REGION)" \
+		GOOGLE_APPLICATION_CREDENTIALS="$(GOOGLE_APPLICATION_CREDENTIALS)" \
+		./scripts/setup-vertex-kind.sh; \
+	fi
 
 kind-status: ## Show all kind clusters and their port assignments
 	@echo "$(COLOR_BOLD)Kind Cluster Status$(COLOR_RESET)"