Blocks: initialize connection assets in Story block

[sergeymitr]

Fixes #39829

Proposed changes:

• Initialize connection assets in the Story block to fix the block assets loading issue.

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

p1729620478710219-slack-C05PV073SG3

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

No.

Testing instructions:

Before you apply this fix, first reproduce the issue.
Then confirm this PR fixes the problem.

[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/jetpack-story-block-connection-assets branch.

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

  bin/jetpack-downloader test jetpack fix/jetpack-story-block-connection-assets
  

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]

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