feat: allow to disable PDB management

[GrigoryPervakov]

Why

In some environments, users are restricted to creating/updating PDBs and need a way to ignore this feature.

What

Add ENABLE_PDB env variable that disables PDB reconciliation and controller informers.

Related Issues

Fixes #141

[GrigoryPervakov]

@Revenge-Rakesh, this PR should fix most problems.
If you need to remove PDBs from the Role too, wait for #159; newer kubebuilder will generate a chart that allows to disable operator roles creation and pass a manually created restricted role

[Copilot]

Pull request overview

Adds a global switch to disable PodDisruptionBudget (PDB) management by the operator, intended for environments where granting PDB permissions is not possible.

Changes:

• Introduces ENABLE_PDB environment variable (default true) and Helm chart value pdbManagement.enable.
• Threads the flag into ClickHouse/Keeper controllers to skip PDB reconciliation steps and to avoid registering PDB ownership watches.
• Updates unit/e2e wiring to account for the new SetupWithManager(..., enablePDB bool) signature.

Reviewed changes

Copilot reviewed 11 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
cmd/main.go	Passes env.EnablePDB into controller setup.
internal/environment/environment.go	Adds EnablePDB env var parsing with default true.
internal/environment/environment_test.go	Adds coverage for ENABLE_PDB=false.
internal/controller/clickhouse/controller.go	Stores EnablePDB on controller; conditionally registers PDB ownership watch; passes flag into reconciler.
internal/controller/clickhouse/controller_test.go	Updates controller construction to include EnablePDB.
internal/controller/clickhouse/sync.go	Gates PDB reconciliation step on EnablePDB.
internal/controller/keeper/controller.go	Stores EnablePDB on controller; conditionally registers PDB ownership watch; passes flag into reconciler.
internal/controller/keeper/controller_test.go	Updates controller construction to include EnablePDB.
internal/controller/keeper/sync.go	Gates PDB reconciliation step on EnablePDB and extracts PDB reconcile logic into its own step.
internal/controller/keeper/sync_test.go	Updates controller construction to include EnablePDB.
test/e2e/e2e_suite_test.go	Updates controller setup calls for new signature.
dist/chart/values.yaml	Adds pdbManagement.enable Helm value and documentation.
dist/chart/templates/manager/manager.yaml	Wires Helm value into ENABLE_PDB env var for the manager container.

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