Currently, the External Secrets Operator manages environment variables for all components (ExternalSecretsCoreController, Webhook, CertController, BitwardenSDKServer) globally. There's no mechanism for users to add or override environment variables on a per-component basis for specific use cases like:  Custom logging configurations ,Feature flags for specific components.

Acceptance criteria:

1. Add OverrideEnv []corev1.EnvVar field to ComponentConfig API with validation to reject reserved prefixes (HOSTNAME, KUBERNETES_, EXTERNAL_SECRETS) 

1. Implement environment variable merge logic that applies user-defined env vars from overrideEnv to matching component deployments, with user values taking precedence over operator defaults.

1. Add unit tests and E2E tests.