fix: container monitor json output

[cmars]

snyk container monitor --json was writing separators between multiple depgraph test results in the output, resulting in an invalid JSON output which does not parse.

This fixes the output by using the same function used to process multiple open source results in the snyk monitor command.

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What does this PR do?

See top posting

Where should the reviewer start?

How should this be manually tested?

Build this branch (make clean build).

Run snyk container monitor --json snyk/snyk:linux | tee output.json.

jq < output.json should exit 0, parse JSON successfully.

Any background context you want to provide?

What are the relevant tickets?

CLI-315

Screenshots

Additional questions