fix: don't print vulnerable paths count for docker tests

[karniwl]

• Ready for review
• Follows CONTRIBUTING rules
• Reviewed by Snyk internal team

What does this PR do?

Removes display of number of vulnerable paths for docker, since currently the count is inaccurate for several reasons:

1. the trees are trimmed quite aggressively in snyk-docker-plugin to reduce size.
2. for rpm & apk based images, we don't differentiate between packages installed manually vs. transitives that were installed automatically.

What are the relevant tickets?

Jira ticket SC-6459

[CLAassistant]

All committers have signed the CLA.

[michael-go]

this better be a fix: commit, rather than feat: .

and please note that the commit message appears later in the Release Notes (https://github.com/snyk/snyk/releases) so maybe reword with:
fix: don't print vulnerable paths count for docker tests

and we better give a reason in the PR body to why we do it. Maybe can just say it's because right now the count is not accurate for several reasons:

1. the trees are trimmed quite aggressively in snyk-docker-plugin to reduce size
2. for rpm & apk based images, we don't differentiate between packages installed manually vs. transitives that were installed automatically

[snyksec]

🎉 This PR is included in version 1.104.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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