fix: controlplane Dockerfile

[jokestax]

Description

The make build.image.controlplane command was failing due to incorrect file paths for src, Cargo.toml, and Cargo.lock. This PR updates the Dockerfile to reference the correct paths within the controlplane directory

Testing

To test this change:

1. Clone the repository.
2. Run make build.image.controlplane.
   The build should complete successfully without any errors.

[linux-foundation-easycla]

• ✅login: jokestax / (c28af9e)

The committers listed above are authorized under a signed CLA.

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[shaneutt]

Thank you for the patch!

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jokestax, shaneutt

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