feature: --workspace flag for kubectl plugins

[ntnn]

Feature Description

Add a -w / --workspace flag for kubectl plugins to override the targeted workspace.
#2634

Proposed Solution

The kubecltl plugins share a common Options: https://github.com/kcp-dev/kcp/blob/main/staging/src/github.com/kcp-dev/cli/pkg/base/options.go

This could be modified to accept a workspace path as a flag and the modify the read kubeconfig to point to the workspace indicated in --workspace.

Alternative Solutions

No response

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Additional Context

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[smorci-alchemist]

/assign