Check Govulncheck binary present or not

[Dee-6777]

What type of PR is this?

bug

What this PR does / Why we need it?

This PR will help in running govulncheck in the systems where govulncheck binary is not present.

Which Jira/Github issue(s) does this PR fix?

Resolves #OSD-18227

Pre-checks (if applicable)

• Ran unit tests locally
• Validated the changes in a cluster
• Included documentation changes with PR

[openshift-ci]

@Dee-6777: all tests passed!

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[codecov-commenter]

Codecov Report

Merging #198 (0bb35f9) into main (265ba04) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #198   +/-   ##
=======================================
  Coverage   51.11%   51.11%           
=======================================
  Files          51       51           
  Lines        3365     3365           
=======================================
  Hits         1720     1720           
  Misses       1364     1364           
  Partials      281      281           

[supreeth7]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Dee-6777, supreeth7

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