fix(code): Support single file test for golang native implementation

[PeterSchafer]

Pull Request Submission Checklist

• Follows CONTRIBUTING guidelines
• Includes detailed description of changes
• Contains risk assessment (Low | Medium | High)
• Highlights breaking API changes (if applicable)
• Links to automated tests covering new functionality
• Includes manual testing instructions (if necessary)
• Updates relevant GitBook documentation (PR link: ___)

What does this PR do?

This fix closes the gap between the legacy code test implementation and the golang native implementation by supporting to test a single file in addition to a folder.

Where should the reviewer start?

snyk/go-application-framework#305

How should this be manually tested?

On a CCI enabled org run snyk code test file.js

[github-actions]

	Warnings
⚠️	Since the CLI is unifying on a standard and improved tooling, we're starting to migrate old-style imports and exports to ES6 ones. A file you've modified is using either module.exports or require(). If you can, please update them to ES6 import syntax and export syntax. Files found: test/jest/acceptance/snyk-code/snyk-code.spec.ts

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