fix: evaluate clusterEnabled flag for clickhouse env

[Steffen911]

Important

Evaluates clickhouse.clusterEnabled to correctly set CLICKHOUSE_CLUSTER_ENABLED in ClickHouse environments, with tests added for verification.

• Behavior:
  • Evaluates clickhouse.clusterEnabled to set CLICKHOUSE_CLUSTER_ENABLED in _helpers.tpl.
  • Sets CLICKHOUSE_CLUSTER_ENABLED to false if clusterEnabled is false or if deploying a single-replica ClickHouse.
  • Does not set CLICKHOUSE_CLUSTER_ENABLED for multi-replica deployments unless clusterEnabled is false.
• Documentation:
  • Updates README.md to clarify clickhouse.clusterEnabled controls CLICKHOUSE_CLUSTER_ENABLED.
• Testing:
  • Adds clickhouse-cluster_test.yaml to test various configurations of CLICKHOUSE_CLUSTER_ENABLED for web and worker deployments.

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[github-actions]

Helm Unit Test Results

33 tests  +6   33 ✅ +6   2s ⏱️ -1s
 8 suites +1    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit a93fac9. ± Comparison against base commit 5359635.

♻️ This comment has been updated with latest results.