Port 2hire customizations to latest Metabase

[AGreenPlace]

Summary

• restore the 2hire default logo in the current TypeScript component while preserving theme-aware coloring
• split Slack dashboard filter fields into groups of at most 10 and keep the author/branding section last
• publish the validated OSS artifact to the existing 2hire ECR repository with current pinned AWS and Docker actions
• keep manually selected commit SHAs consistent when naming and retrieving uberjar artifacts

Context

The deployed master branch was compared against the substantially newer Metabase code on metabase-sync. Existing upstream implementations were retained where they supersede the old customization: skip_if_empty already removes individual empty cards, and Slack already chunks large outgoing block payloads. Reverted attachment batching, serialized debug logging, disabled pre-commit hooks, and removal of the shared EE build were intentionally not carried forward.

Validation

• bun run lint-format-pure — passed across 12,243 files
• bun run lint-eslint-pure — passed
• bun run type-check — passed after rebuilding 491 ClojureScript modules with zero warnings
• ./bin/test-agent :only '[metabase.channel.impl.slack-test]' — 11 tests and 26 assertions passed
• focused Clojure lint — zero errors and warnings
• workflow YAML lint and parsing — passed
• repository pre-commit pipeline — passed