refine tokenFile write logic

[andyzhangx]

blob-csi-driver/pkg/blob/blob.go

Line 601 in 1f8185b

azureOAuthTokenFile := filepath.Join(defaultAzureOAuthTokenDir, clientID+accountName)

The file path is constructed by directly concatenating clientID and accountName without any sanitization or validation. If clientID contains path traversal characters like "../" or if it's empty, this could lead to unexpected file paths issues. Consider validating clientID for invalid characters or using a safer path construction method like filepath.Clean() after ensuring clientID is non-empty.

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