chore: add support for replicas for opensearch, redis, rabbitmq and postgres

[pratapalakshmi]

Summary by CodeRabbit

• New Features

  • Added PostgreSQL read-replica configuration support for distributed database reads and improved performance
  • Introduced configurable replica counts for stateful services (Redis, PostgreSQL, RabbitMQ, OpenSearch)

• Chores

  • Helm chart version updated to 2.3.4

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Walkthrough

The Helm chart version is incremented from 2.3.2 to 2.3.4. Configuration files are updated to support PostgreSQL read-replica settings and explicit replica counts for stateful services (Redis, PostgreSQL, RabbitMQ, OpenSearch), each defaulting to 1.

Changes

Cohort / File(s)	Summary
Version Bump charts/plane-enterprise/Chart.yaml	Helm chart version updated from 2.3.2 to 2.3.4.
Read Replica Support charts/plane-enterprise/templates/config-secrets/app-env.yaml	Adds optional DATABASE_READ_REPLICA_URL secret and ENABLE_READ_REPLICA config flag, conditionally populated based on .Values.services.postgres.read_replica.enabled.
Stateful Service Replicas charts/plane-enterprise/templates/workloads/opensearch.stateful.yaml, postgres.stateful.yaml, rabbitmq.stateful.yaml, redis.stateful.yaml	Each StatefulSet now explicitly defines replica count from .Values.services.[service].replicas, defaulting to 1 when unset.
Values Configuration charts/plane-enterprise/values.yaml	Adds replicas: 1 configuration for redis, postgres, rabbitmq, and opensearch; introduces services.postgres.read_replica settings block with enabled and remote_url fields.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 Hoppy times in Helm we see,
Replicas now set to three!
Well, to one, for scaling wise,
Read-replicas reach the skies,
Config hops on, version bumped with glee! 🚀

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore: add support for replicas for opensearch, redis, rabbitmq and postgres' clearly and accurately summarizes the main change across all modified files, which adds replica configuration support for four stateful services.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add/replicas/for/stateful/services

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