Align HelmRelease 'timeout' settings for workload clusters

Aligns the HelmRelease timeout configuration in sylva-units-operator for workload clusters with the settings used in sylva-core till version 1.5 as we were not using operator for the deployment before

pkg/helmrelease/helmrelease.go

Added function that checks if cluster is workload based on valuesFrom entry and then apply timeout settings

• Added Install.Timeout: 5m - explicit timeout for Helm install operations
• Added Upgrade.Timeout: 5m - explicit timeout for Helm upgrade operations
• Set Timeout: 80m - overall timeout for delete-hook operations
• Kept Uninstall.Timeout: 25m (non-CAPM3) / 80m (CAPM3) - infrastructure-dependent uninstall timeout

Also, added controller tests to check if timeout settings are applied correctly

closes #56 (closed)