Use Docker Hub Redpanda image

[cristianrgreco]

Summary

• Switch the Redpanda module image reference from docker.redpanda.com/redpandadata/redpanda:v26.1.8 to docker.io/redpandadata/redpanda:v26.1.8.
• Avoid the Redpanda registry alias path that hit Docker Hub unauthenticated pull-rate limits in CI.

Verification

• Confirmed Docker Hub has redpandadata/redpanda:v26.1.8.
• npm run test -- packages/modules/redpanda/src/redpanda-container.test.ts
• git diff --check

Test results

• Redpanda targeted tests: 4 passed.
• Whitespace check: passed.

Non-breaking evidence

• This keeps the same Redpanda image tag, v26.1.8; only the registry host changes.
• The change is limited to the Redpanda test Dockerfile and does not alter public APIs, exported types, runtime module code, or docs.

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