[INF-7570] startupProbe support for workflows-backend + agent-sandbox-controller

[lukefoster11]

Add startup probe support in the chart for workflow-backend and agent-sandbox-controller.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; both startup probes are opt-in and align with the existing health contracts of their respective workloads.

The new values remain disabled by default, the templates target the same endpoints and ports already used by existing probes, both public values files remain synchronized, and CI scenarios exercise the enabled branches.

Important Files Changed

Filename	Overview
charts/retool/templates/deployment_workflows.yaml	Adds a conditional workflow-backend startup probe consistent with that container’s existing liveness and readiness probe contract.
charts/retool/templates/deployment_agent_sandbox.yaml	Adds a conditional controller startup probe using the controller’s existing /livez endpoint and named HTTP port.
charts/retool/values.yaml	Defines disabled-by-default startup-probe settings for both affected workloads.
values.yaml	Keeps the customer-facing values copy synchronized with the chart defaults.
charts/retool/ci/test-workflows-startup-probe-option.yaml	Exercises rendering of the workflow-backend startup-probe branch.
charts/retool/ci/test-agent-sandbox-enabled-option.yaml	Extends the broad agent-sandbox scenario to exercise the controller startup probe.

_{Reviews (1): Last reviewed commit: "workflow-backend + agent-sandbox-control..." | Re-trigger Greptile}