This aims to remove ksqldb-related codebase from realtime API. We will also remove ksqldb-related dependencies from other repos.
**To do**
[x] Remove `docker/ksqldb_services` from `general/cdtools`. Realtime should build using usual docker file as other kafka services.
[x] Remove `ksqldb` migration
[] Remove `ksqldb` from `infrastructure/custom-images`.
[] Remove all ksqldb specific grafana panel and metrics
[x] Remove "docker-compose sunset" from realtime
[x] Remove handler code `ksqldbarticles`. Remove fallback from /articles endpoint.
[x] Remove `libraries/ksqldb`
[x] Remove `resolver/sql.go`
[x] Remove all ksqldb env variables and its usages
[] Clean up service-deploys as well.
[] Deploy to dev and prod
**Acceptance criteria**
[x] All ksqld dependencies/handling removed from realtime
[] Integration test passes in dev and prod