feat: add user-operation commands (ResetPassword/Reset2FA/Lock/Unlock)

[RapidNode777]

Description

This PR adds a new d8 user-operation command group to deckhouse-cli to perform Dex local user management actions via UserOperation custom resources provided by the user-authn module.

The commands create UserOperation resources and optionally wait until the operation is completed, returning success or an error based on the resource status.

Related main implementation PR in Deckhouse:
deckhouse/deckhouse#15561

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Why do we need it, and what problem does it solve?

Cluster administrators often need to manage local Dex users (reset password, reset 2FA, lock/unlock accounts) without manually editing Dex storage or crafting Kubernetes YAML by hand.

With the main Deckhouse implementation, these actions are handled declaratively via UserOperation resources.
This PR provides a convenient CLI interface to create such resources and track their execution, making user management faster, safer, and less error-prone.

It simplifies operations such as:

• Resetting a user’s password.
• Forcing a reset of 2FA (TOTP).
• Locking or unlocking a user account for a specified period of time.

The commands automate resource creation and status tracking, reducing manual intervention and enabling consistent automation.

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Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in a Kubernetes cluster manually.

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Changelog entries

section: user-authn
type: feature
summary: Introduce `d8 user-operation` commands to execute Dex local user management operations via UserOperation resources
impact_level: default