fix: support blobfuse2 install for GKE cos node

[andyzhangx]

What type of PR is this?
/kind bug

What this PR does / why we need it:
fix: support blobfuse2 install for GKE cos node

Which issue(s) this PR fixes:

Fixes #2109

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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[Copilot]

Pull Request Overview

This PR fixes blobfuse2 installation support for Google Kubernetes Engine (GKE) Container-Optimized OS (COS) nodes by adding COS-specific handling to the installation scripts.

• Adds COS distribution detection and routing to the RHCOS installation script
• Configures COS-specific binary installation path (/home/kubernetes/bin)
• Fixes variable quoting issues in shell scripts for better robustness

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
pkg/blobfuse-proxy/install-proxy.sh	Fixes variable quoting for KUBELET_PATH
pkg/blobfuse-proxy/install-proxy-rhcos.sh	Adds COS support with configurable binary path and fixes variable quoting
pkg/blobfuse-proxy/init.sh	Routes COS distribution to use RHCOS installation script

[andyzhangx]

/retest

[k8s-ci-robot]

@andyzhangx: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-blob-csi-driver-external-e2e-nfs	aa044b7	link	true	/test pull-blob-csi-driver-external-e2e-nfs
pull-blob-csi-driver-e2e-proxy	aa044b7	link	true	/test pull-blob-csi-driver-e2e-proxy

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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