fix: switch to lh handler

[otsybizov]

🤖 Linear

Closes CONG-XXX

[Copilot]

Pull request overview

Re-enables the Lighthouse “handler” path in mainnet staging by turning back on the Lighthouse queue Redis + PrivateLink plumbing and deploying the Lighthouse handler ECS service (instead of the prior lambda poller approach).

Changes:

• Enable lighthouse_handler ECS service in core staging and include it in CI deploy/health-check flow.
• Provision Lighthouse queue Redis + PrivateLink provider (core) and consumer endpoint (backend) for cross-VPC access.
• Expose core Terraform outputs needed by backend remote-state to configure Redis connectivity.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
ops/mainnet/staging/core/outputs.tf	Re-enables outputs needed for backend to consume Lighthouse queue Redis/PrivateLink details.
ops/mainnet/staging/core/main.tf	Turns on lighthouse handler ECS service and Lighthouse queue Redis + PrivateLink provider.
ops/mainnet/staging/core/config.tf	Reintroduces lighthouse_handler_env_vars including direct Redis URL for the handler.
ops/mainnet/staging/backend/main.tf	Re-enables PrivateLink consumer endpoint to reach core’s Lighthouse queue Redis.
ops/mainnet/staging/backend/config.tf	Re-adds REDIS_URL for cartographer-handler via PrivateLink endpoint (with TLS SNI).
.github/workflows/build-test-deploy.yml	Adds lighthouse-handler back into ECS service list and ensures handler image build precedes core staging apply.

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