Social Logos: Add post-build tests

[tbradsha]

This moves the existing test out of the build script and adds a few more rudimentary post-build tests. This will help prevent silent errors from resulting in a broken build (e.g. regressions discovered/fixed in #37799).

As written, it runs as part of composer build-production. Feel free to adapt as desired.

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

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

Testing instructions:

Run composer build-production and verify it works as expected.

[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 add/social-logos/tests branch.

  • For jetpack-mu-wpcom changes, also add define( 'JETPACK_MU_WPCOM_LOAD_VIA_BETA_PLUGIN', true ); to your wp-config.php file.

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

  bin/jetpack-downloader test jetpack add/social-logos/tests
  

  bin/jetpack-downloader test jetpack-mu-wpcom-plugin add/social-logos/tests
  

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!

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[anomiex]

I think #37799 probably already cleaned up most of the possibilities for errors by making the various scripts actually fail if something goes wrong.

[github-actions]

This PR has been marked as stale. This happened because:

• It has been inactive for the past 3 months.
• It hasn’t been labeled `[Pri] BLOCKER`, `[Pri] High`, etc.

If this PR is still useful, please do a [trunk merge or rebase](https://github.com/Automattic/jetpack/blob/trunk/docs/git-workflow.md#keeping-your-branch-up-to-date) and otherwise make sure it's up to date and has clear testing instructions. You may also want to ping possible reviewers in case they've forgotten about it. Please close this PR if you think it's not valid anymore — if you do, please add a brief explanation.

If the PR is not updated (or at least commented on) in another month, it will be automatically closed.

[tbradsha]

I don't really care about the specifics of most of the tests (other than exit code 2); mostly I wanted to decouple tests from the build process, and figured I'd add a few simple tests in the meantime. Happy to remove any deemed pointless!

[tbradsha]

Rebased.

[anomiex]

Let's do it