fix: prep cloud configs

[vvalderrv]

• Remove EC2 configs
• Add K8s plugin

[Copilot]

Pull Request Overview

This PR prepares cloud configurations for a transition from EC2-based Jenkins agents to Kubernetes-based agents. It removes AWS EC2 configurations and adds the Kubernetes plugin as a dependency.

• Removes AWS EC2 cloud agent configurations from Jenkins
• Adds the Kubernetes plugin to the build plugins list
• Replaces cloud configurations with empty arrays and placeholder comments

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
build/plugins.txt	Adds kubernetes plugin to the build dependencies
base/jenkins/values.yaml	Removes AWS EC2 cloud configuration and replaces with empty array
base/jenkins/jcasc_yamls/07-cloud-agents.yaml	Removes AWS EC2 cloud configuration and replaces with empty array

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