Configure kubelet through generated configuration

[hbc (bcho)]

Summary

• map the controlled FlexNode kubelet settings (maxPods, verbosity, and image GC thresholds) into Unbounded's generated KubeletConfiguration
• expose optional kubelet exec image credential provider config and binary paths without exposing arbitrary kubelet configuration
• keep Machine goal ownership and persistence unchanged; Azure-side max pods and image GC settings are immutable, and broader authoritative goal handling remains tracked by Make ARM Machine goals authoritative and acknowledge RP node updates #256
• document credential provider rootfs/read-only mount setup and add validation, adapter, and copy coverage

Dependency

This is pinned to the current head of draft upstream PR Azure/unbounded#573. Replace the pseudo-version with the containing Unbounded release after that PR merges.

Testing

• make check

[Copilot]

Pull request overview

Maps FlexNode-managed kubelet settings into Unbounded’s generated configuration and adds exec image credential provider support.

Changes:

• Maps max pods, image GC thresholds, and verbosity into KubeletConfiguration.
• Adds credential provider configuration, validation, documentation, and tests.
• Updates Unbounded and Kubernetes dependencies.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/config/config.go	Adds credential provider schema and validation.
pkg/config/adapter.go	Maps kubelet settings into agent configuration.
pkg/config/adapter_test.go	Tests agent configuration mapping.
pkg/config/kubelet_config_test.go	Tests JSON parsing and provider validation.
pkg/config/copy_test.go	Verifies provider configuration is deeply copied.
docs/usages/configuration.md	Documents provider configuration and mounts.
go.mod	Updates Unbounded and Kubernetes dependencies.
go.sum	Updates dependency checksums.

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[Copilot]

Pull request overview

Copilot reviewed 7 out of 8 changed files in this pull request and generated no new comments.