[Epic] Updates to the Loki Helm Chart for Loki 4.0 #19634
Description
Creating an Epic to collect ideas for how to update the Loki Helm Chart for Loki 4.0.
### Tasks
[ ] Remove references to Grafana Agent (EOL on November 1, 2025)
[ ] Remove references to Promtail ( EOL on March 2, 2026)
[ ] Remove table manager
[ ] Remove BoltDB
[ ] Remove references to deprecated storage.
[ ] Add/Improve Kafka support
[ ] Add/Improve Thanos support