Protect Status: Combine multiple vulnerabilities for the same extension into single threat objects

[nateweller]

Updates the protect-status package to group vulnerabilities by extension (i.e. one threat per vulnerable extension).

Proposed changes:

• Adds Vulnerability_Model class.
• Adds Threat_Model::$vulnerabilities property.
• Updates Protect_Status to generate a single Threat_Model per vulnerable extension, with the relevant vulnerabilities included as a property of the threat.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

peb6dq-3ma-p2

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• Validate results from jetpack-protect/v1/status with a free plan.

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the protect-status/combine-vulns-into-extension-threat branch.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack protect-status/combine-vulns-into-extension-threat
  

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

• ✅ Include a description of your PR changes.
  
• ✅ Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
• ✅ Add a "[Type]" label (Bug, Enhancement, Janitorial, Task).
  
• ✅ Add testing instructions.
  
• ✅ Specify whether this PR includes any changes to data or privacy.
  
• ✅ Add changelog entries to affected projects
  

This comment will be updated as you work on your PR and make changes. If you think that some of those checks are not needed for your PR, please explain why you think so. Thanks for cooperation 🤖

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The e2e test report can be found here. Please note that it can take a few minutes after the e2e tests checks are complete for the report to be available.

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Follow this PR Review Process:

1. Ensure all required checks appearing at the bottom of this PR are passing.
2. Choose a review path based on your changes:
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     • Example: Updating a team-specific component or a small change to a shared library.
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     • Example: Major updates to a shared library or complex features.
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