Add delete cluster command

[josefkarasek]

No description provided.

[Copilot]

Pull request overview

This PR adds support for deleting clusters via the CLI, wiring the new command through the service interface and API client, and extending tests to cover the new behavior.

Changes:

• Add kedify delete cluster [name|id] with optional interactive cluster selection when no name/id is provided.
• Extend ClusterService and the API client with DeleteCluster, including a small HTTP request helper refactor.
• Update fakes and tests across CLI and API packages to satisfy the new interface and validate the DELETE endpoint call.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/service/cluster.go	Extends the ClusterService interface with DeleteCluster.
internal/cli/run.go	Registers the new delete command group and delete cluster subcommand.
internal/cli/list/recommendations_test.go	Updates fake service to implement the new DeleteCluster interface method.
internal/cli/list/clusters_test.go	Updates fake service to implement the new DeleteCluster interface method.
internal/cli/get/cluster.go	Exposes cluster lookup/UUID helpers for reuse by the delete command.
internal/cli/get/cluster_test.go	Updates tests to use the exported helper and implements the new interface method on the fake.
internal/cli/delete/cluster.go	Implements the new delete cluster command (name/id + interactive selection) and prints status to stderr.
internal/cli/delete/cluster_test.go	Adds end-to-end style tests for deleting by name, by UUID, and via selector.
internal/api/client.go	Adds DeleteCluster and refactors request handling with a reusable doRequest helper.
internal/api/client_test.go	Adds a test asserting DELETE method/path for the delete endpoint.

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