cleanup: add more logging in blobfuse-proxy when blobfuse2 not found

[andyzhangx]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
cleanup: add more logging in blobfuse-proxy when blobfuse2 not found

Which issue(s) this PR fixes:

Fixes #

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 adds enhanced logging to the blobfuse-proxy server to provide more diagnostic information when blobfuse2 executable is not found during mount operations.

Key Changes

• Enhanced error handling in the MountAzureBlob function to detect "executable file not found" errors
• Added PATH environment variable and command output to error messages for better debugging

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[andyzhangx]

/retest

[andyzhangx]

/cherrypick release-1.26

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #2131

In response to this:

/cherrypick release-1.26

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