feat: OS CLI output part II - newline separates issues +test

[florindumitrascu]

• [x] Follows CONTRIBUTING rules

What does this PR do?

Improve snyk-open-source CLI output as follows:

• New line to separate the issues one from another

Where should the reviewer start?

src/lib/formatters/remediation-based-format-issues.ts

How should this be manually tested?

Run 'snyk test' command on a local project and compare output formatting with the attached screenshot

Any background context you want to provide?

What are the relevant tickets?

TUN-269

Screenshots

Additional questions