remove deprecated io/ioutil package reference from goscaleio

[VamsiSiddu-7]

Description

This PR removes the references of deprecated io/ioutil from goscalio

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#916
dell/csm#885

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, vetting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Backward compatibility is not broken

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Unit tests passed with 100%
• Manually invoked the functions which has changes and there is no regression identified
• Run Cert-csi after installing the driver with the changes and the cert-csi passed with 100%

[2023-08-14 06:37:42]  INFO Avg time of a run:   55.59s
[2023-08-14 06:37:42]  INFO Avg time of a del:   24.97s
[2023-08-14 06:37:42]  INFO Avg time of all:     83.58s
[2023-08-14 06:37:42]  INFO During this run 100.0% of suites succeeded