Config follow-up: Implement component override functionality for Config resource

[andreaskaris]

This commit adds the ability to mark components as unmanaged in the
bpfman-operator, preventing the operator from creating or updating
specific objects. The implementation includes:

• Added ComponentOverride struct to Config API with fields for
  kind, group, namespace, name, and unmanaged flag
• Modified assureResource function to check for overrides and skip
  management of unmanaged components
• Implemented isOverridden helper function to match objects against
  override specifications
• Added tests to verify override functionality works correctly
  across all component types

Documentation

This will need documentation that states how to generate the overrides, e.g. (generated with an LLM, lgtm but haven't had the time to retest the below combinations, yet):

  apiVersion: bpfman.io/v1alpha1
  kind: Config
  metadata:
    name: bpfman-config
  spec:
    # Existing configuration...
    namespace: bpfman
    image: quay.io/bpfman/bpfman:latest
    agent:
      image: quay.io/bpfman/bpfman-agent:latest
      logLevel: info
    logLevel: info

    # Component override for the main deployment
    overrides:
    - kind: DaemonSet
      group: apps
      namespace: bpfman
      name: bpfman-daemon
      unmanaged: true

Using JSON patch for more precise control:

  kubectl patch config bpfman-config --type='json' -p='[
    {
      "op": "add",
      "path": "/spec/overrides",
      "value": [
        {
          "kind": "DaemonSet",
          "group": "apps",
          "namespace": "bpfman", 
          "name": "bpfman-daemon",
          "unmanaged": true
        }
      ]
    }
  ]'

  If you want to add multiple overrides or append to existing ones:

  kubectl patch config bpfman-config --type='json' -p='[
    {
      "op": "add",
      "path": "/spec/overrides/-",
      "value": {
        "kind": "DaemonSet",
        "group": "apps",
        "namespace": "bpfman",
        "name": "bpfman-daemon", 
        "unmanaged": true
      }
    }
  ]'

The /- notation appends to the existing overrides array rather than replacing it.

[mergify]

@andreaskaris, this pull request is now in conflict and requires a rebase.