release: add committed patch and pre-rendered operator manifests for GitOps (#11757)

[fkc1e100]

Summary & Rationale

Currently, GitOps tools (like ArgoCD or Flux) cannot target upstream repository paths directly because operator/config/manager/manager_image_patch.yaml and operator/config/autopilot-manager/manager_image_patch.yaml were generated dynamically at build time and excluded via .gitignore. Running kustomize build operator/config/default or kustomize build config/installbundle/release-manifests/standard directly from git source fails with manager_image_patch.yaml: no such file or directory.

This PR:

1. Adds committed default manager_image_patch.yaml files for standard and autopilot operator configs pointing to the canonical release operator image.
2. Unignores manager_image_patch.yaml in .gitignore.
3. Adds pre-rendered, unbundled operator manifests (configconnector-operator.yaml and autopilot-configconnector-operator.yaml) under config/installbundle/release-manifests/ for direct GitOps deployment.
4. Updates docs/guides/gitops-argocd.md to document direct repository path sync for ArgoCD and Flux.

Fixes #11757.
Relates to #11689.

[google-oss-prow]

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[vistasunil]

This PR looks exactly what we needed. I will eagerly wait for this PR to get merged.