Simplify tunneled E2E setup

[j0sh]

Summary

• restore concurrent in-a-box recording tests
• consolidate synchronized output, MinIO readiness, and object-store URL helpers
• wait for Catalyst API and orchestrator readiness before submitting each VOD request exactly once
• redact trycloudflare URLs from captured container and command output
• keep the catalyst-api and go-livepeer revisions plus the signing, misspell, and checksum changes unchanged

Known blocker

The E2E suite still requires public Cloudflare quick tunnels because the current catalyst-api requires callback_url and rejects private object-store destinations. The focused TODO documents the follow-up: optional VOD callbacks plus an empty-by-default exact host:port allowlist enforced during validation and dialing, followed by configuring in-a-box for its local MinIO and Task Runner endpoints.

Local validation

• go test -race ./test/e2e -short
• go test ./... -short
• go vet ./...
• git diff --check

The complete Docker-backed E2E suite will run in CI because Docker and cloudflared are not installed on the development host.