fix: lh redis queue name and job ordering

[otsybizov]

🤖 Linear

Closes CONG-XXX

[Copilot]

Pull request overview

Updates mainnet-staging infrastructure configuration so the Lighthouse Redis queue resources use a shorter family name, and ensures the CI deploy ordering reflects Terraform root dependencies.

Changes:

• Rename the Redis family for lighthouse_queue_cache from lighthouse-queue to lh-queue in mainnet-staging core Terraform.
• Update GitHub Actions so the mainnet-staging backend Terraform job waits for the core Terraform job to complete.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
ops/mainnet/staging/core/main.tf	Renames the Lighthouse queue Redis family, affecting generated ElastiCache/SG/subnet group names.
.github/workflows/build-test-deploy.yml	Adds an explicit job dependency so staging backend Terraform runs after staging core Terraform.

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