fix: enable Kaniko archive (CN-942)

[ividalATSnyk]

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

What does this PR do?

• enable Kaniko Archive content extraction

Where should the reviewer start?

The change itself is entirely localized to getAndValidateArchivePath(targetImage) in scan.ts

How should this be manually tested?

You can confirm our changes work via:

npx jest test/system/image-type/kaniko-archive.spec.ts
npx jest test/lib/extractor/extractor.spec.ts

Any background context you want to provide?

This error went unnoticed because we weren't actually testing the extractContent flow for archives other than DockerArchive.

What are the relevant tickets?

CN-942

[snyk-pr-review-bot]

PR Reviewer Guide 🔍

🧪 PR contains tests

🔒 No security concerns identified

⚡ No major issues detected

📚 Repository Context Analyzed This review considered 5 relevant code sections from 4 files (average relevance: 0.74) lib/extractor/index.ts (lines 1-230) lib/extractor/kaniko-archive/layer.ts (lines 1-134) lib/analyzer/image-inspector.ts (lines 1-284) lib/scan.ts (2 segments, lines 1-247)