Fetch only necessary plugins

[jaydeokar]

What type of PR is this? cleanup

Which issue does this PR fix?: Just pulls necessary plugins from container networking plugins

What does this PR do / Why do we need it?: Removes unnecessary plugins

Testing done on this change: N/A

Will this PR introduce any new dependencies?: N/A

Will this break upgrades or downgrades? Has updating a running cluster been tested?: N/A

Does this change require updates to the CNI daemonset config files to work?: N/A

Does this PR introduce any user-facing change?:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[Copilot]

Pull Request Overview

This PR optimizes the build process by fetching only necessary CNI plugins instead of all available plugins. It reduces the size of the final container image by limiting the copied plugins to only those actually required by the VPC CNI.

• Introduces a variable to specify core plugins needed for operation
• Modifies the copy command to only include the specified plugins

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[jaydeokar]

This workflow to update github actions is no longer needed as dependabot does this for us