Disable version control metadata for unit tests

[atye]

Description

Set go flag to disable version control information when executing go list. If the version control information isn't available for whatever reason, go list will fail which breaks the excluded directories in the unit tests.

error obtaining VCS status: exit status 128
	Use -buildvcs=false to disable VCS stamping.

See https://github.com/dell/gopowerstore/actions/runs/12182452316/job/33993511339.

Issues

List the issues impacted by this PR:

Issue ID
dell/csm#1559

Checklist:

• I have performed a self-review of my own code
• 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

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

Checks pass in dell/gopowerstore#153.