Protect Status: prevent undefined extension warning

[nateweller]

Fixes:

Warning	Undefined array key "woocommerce"	

    /usr/local/src/jetpack-monorepo/projects/packages/protect-status/src/class-scan-status.php:246
    Automattic\JetpackBeta\Hooks::custom_error_handler()
    /usr/local/src/jetpack-monorepo/projects/packages/protect-status/src/class-scan-status.php:246
    Automattic\J\P\Scan_Status::normalize_api_data()
    /usr/local/src/jetpack-monorepo/projects/packages/protect-status/src/class-scan-status.php:81
    Automattic\J\P\Scan_Status::get_status()
    /usr/local/src/jetpack-monorepo/projects/packages/protect-status/src/class-status.php:72
    Automattic\J\P\Status::get_status()
    /usr/local/src/jetpack-monorepo/projects/packages/protect-status/src/class-status.php:164
    Automattic\J\P\Status::get_total_threats()
    /usr/local/src/jetpack-monorepo/projects/plugins/protect/src/class-jetpack-protect.php:145
    Jetpack_Protect->admin_page_init()
    wp-includes/class-wp-hook.php:324
    do_action('_admin_menu')
    wp-admin/includes/menu.php:41

Proposed changes:

• Adds null coalescing operators to default the value of $installed_extension to null instead of throwing a PHP Warning when an extension from the scan report is not present on the site.

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

N/A

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

No

Testing instructions:

• On a site with Jetpack Protect and Query Monitor, view the scan tab and ensure no PHP warnings are detected by QM.

[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 fix/protect-status/undefined-extension-warning branch.

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

  bin/jetpack-downloader test jetpack fix/protect-status/undefined-extension-warning
  

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:

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• ✅ Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
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• ✅ 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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Follow this PR Review Process:

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