feat: set target-reference value in the container monitor request UNIFY-124

[adrobuta]

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What does this PR do?

Adds support for the target-reference parameter for snyk container monitor command

Where should the reviewer start?

How should this be manually tested?

snyk container monitor gcr.io/distroless/nodejs:latest --platform=linux/arm64 --target-reference=target_reference_test

Any background context you want to provide?

https://snyksec.atlassian.net/wiki/spaces/RD/pages/2027487415/target-reference+argument+support+on+the+snyk+container+monitor+command

What are the relevant tickets?

https://snyksec.atlassian.net/browse/UNIFY-124

Screenshots

Additional questions

[github-actions]

	Warnings
⚠️	Please make changes to snyk help text in Gitbook. Changes will be automatically synchronised to Snyk CLI as a scheduled PR. For more information, see: help/README.md.

Generated by 🚫 dangerJS against 51ed8f5

[SteveShani]

Such a simple change :)

Is it worth adding a test? Do tests exist for CLI flags?

[cmars]

A test demonstrating that the option makes it through to a mocked API request would be great so we're sure this works, and we can ensure that it continues to work in the future through refactorings and other changes.

Questions:

• Does this add the flag to other test and monitor commands as well?
• Should container use the existing function generateMonitorMeta?
• What is the plan for updating user documentation and --help, given this is a user-facing change?

[adrobuta]

@SteveShani @cmars thanks for the review!
The last re-spin of the PR addresses some of the raised points:

• A test has been added to check if the options gets forwarded to the monitor endpoint.
• I have updated the container monitor help doc to contain the newly added option.

The flag is added only to container monitor command, not affecting other test/monitor commands.
For the moment, generateMonitorMeta can't be used for container monitor because that would imply some refactoring of the code which is outside of the scope of this PR.

[cmars]

Looks good now, thanks!