…gration setup

- Added integration test suite with setup and teardown scripts for Kubernetes cluster.
- Introduced new Makefile targets for integration testing: `setup-integration`, `test-integration`, and `teardown-integration`.
- Created `values.yaml` for configuration of GPU resources and device plugins.
- Updated device class name in deployment manifests to align with new naming conventions.
- Enhanced health check configurations for the DRA plugin.
- Removed deprecated deployment example file.

…orkflow to add dra-plugin-gpu component

…ackage

…_test.go

… directory and initialize checkpoints. Added checkpoint.json for managing prepared claims.

- Introduced a new 'integration' job in the CI workflow to run integration tests.
- Set up Go and Docker Buildx for the integration environment.
- Installed 'kind' for Kubernetes cluster management.
- Updated the release-docker job dependencies to include the new integration tests.

…app runner

- Simplified the main application logic by creating a new app runner in dra-plugin-gpu.
- Moved configuration and initialization logic into a dedicated DraPluginGpuApp struct.
- Enhanced environment variable handling for NODE_NAME in CDI specifications.
- Improved directory validation and creation processes.
- Updated tests to ensure NODE_NAME is correctly set in the CDI spec files.

…andard log package

- Removed usage of klog in favor of the standard log package for logging.
- Updated Shutdown methods to eliminate logger parameters.
- Adjusted logging statements throughout the codebase for consistency and clarity.
- Cleaned up go.mod and go.sum by removing unused dependencies.

…nctions

…GPU plugin

…ple pods

… dependency on kubeletplugin.Helper and note that this is covered by integration tests.