refactor(CSI-330): use native kubernetes client for handling labels and remove reliance on kubectl init container

[sergeyberezansky]

TL;DR

Removes kubectl dependency and improves node label cleanup during CSI driver shutdown.

What changed?

• Removed kubectl binary and version from Dockerfile
• Replaced init container node label management with in-code Kubernetes client
• Added graceful shutdown handling with SIGTERM/SIGINT signals
• Implemented node label cleanup using k8s client-go instead of kubectl commands
• Added context propagation through driver initialization and runtime
• Added driver reference to config for improved state management

How to test?

1. Deploy the CSI driver in a Kubernetes cluster
2. Verify node labels are properly cleaned up when:
   • The driver starts up
   • The driver shuts down gracefully (SIGTERM)
   • The driver is forcefully terminated (SIGINT)
3. Confirm no kubectl-related errors appear in logs

Why make this change?

The previous implementation relied on kubectl commands for node label management, which added unnecessary dependencies and potential security risks. Moving to the official Kubernetes client library provides better reliability, security, and error handling while reducing the container image size.

[sergeyberezansky]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(CSI-334): allow using multiple mounters in parallel on same server #465
• chore(deps): update go dependencies as of 2025-02-16 #464
• fix(CSI-332): collision on OCP machineConfigs when installing multiple instances due to same name #463
• fix(CSI-331): add terminationGracePeriodSeconds to controller and pod workloads #462
• fix(CSI-329): report volume accessible topology with label corresponding to driver name for multiple instances in large clusters #461
• refactor(CSI-330): use native kubernetes client for handling labels and remove reliance on kubectl init container #460 👈 (View in Graphite)
• ci(chore): update workflows to use larger server group #459
• dev

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