LA improvement

[yutpeng]

Description

• Adds configurable namespace handling for operator, CAPI, CAPOCI, managed CAPI resources, and cluster-autoscaler resources.
• Adds poolIdentifier support so autoscaler node pool resources can be named more clearly.
• Adds explicit autoscaler status phases and conditions for policy validation, provider readiness, autoscaler readiness, scaling resource readiness, and cleanup.
• Updates CAPI/CAPOCI/autoscaler reconciliation to support the new namespace model.
• Updates CSR approval and bootstrap/kubeconfig handling for the managed resource namespace.
• Tightens CRD validation for names, namespaces, min/max values, and immutable fields.
• Updates RBAC for the resources now reconciled by the operator.
• Removes orphan cleanup and Dockerfile helper code that is no longer part of the operator flow.
• Updates docs, samples, Makefile release/cleanup targets, and image defaults for the Oracle Samples repository.
• Adds and updates unit tests for API validation, namespace config, status handling, CSR approval, CAPI resource generation, autoscaler values, and ignition helpers.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Fully clustered installation and scale-up testing

Test Configuration:

• Firmware version: N/A
• Hardware:
• Toolchain: Go 1.26.1
• SDK:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules