Exclude generated code from being processed by gosec

[falfaroc]

Description

Update the gosec action to include the -exclude-generated flag. This will bypass checking any file that has been generated by some generator.

See: https://github.com/securego/gosec?tab=readme-ov-file#excluding-generated-files

Issues

List the issues impacted by this PR:

Issue ID
https://github.com/dell/csm/issues/1707

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

• Ensured that gosec successfully ignores generated code that previously detected issues.
• Ensured that fixes work as expected (https://github.com/dell/csm-hbnfs/actions/runs/13947668363/job/39038627815?pr=9).