feat: add unmanaged service test call ff

[dagrest]

• Follows CONTRIBUTING rules

What does this PR do?

• Implements Feature Flag to switch to a new polling function that uses a new Unmanaged Service APIs
• Implements a new polling function that uses a new Unmanaged Service APIs

Where should the reviewer start?

Implementation begins in the following function: resolveAndTestFacts

How should this be manually tested?

Use the following options: test --unmanaged, do not forget to enable feature flag, current name is 'snykNewUnmanagedTest'

What are the relevant tickets?

• Implement CLI feature flag for new service: TUN-299
• Update CLI polling functions to point at the unmanaged service: TUN-317

[dekelund]

can't we move this return into the try, and reduce number or variables, alternative use a const in the try-block.