test: add acceptance test for Go stdlib detection in container scans

[bgardiner]

Pull Request Submission Checklist

• Follows CONTRIBUTING guidelines
• Commit messages
  are release-note ready, emphasizing
  what was changed, not how.
• Includes detailed description of changes (N/A)
• Contains risk assessment (Low | Medium | High)
• Highlights breaking API changes (if applicable)
• Links to automated tests covering new functionality (N/A)
• Includes manual testing instructions (if necessary)
• Updates relevant GitBook documentation (N/A)
• Includes product update to be announced in the next stable release notes (N/A)

What does this PR do?

Verifies that snyk-docker-plugin detects Go standard library dependencies when scanning container images with Go binaries.

Requested here: #6656 (review).

Where should the reviewer start?

Review the test.

How should this be manually tested?

N/A.

What's the product update that needs to be communicated to CLI users?

N/A

Risk assessment (Low | Medium | High)?

Low.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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