Bundle boot, theme and route in Jetpack

[simison]

Local alternative to upstream change:

• Dependency extraction: bundle theme, route and boot by default WordPress/gutenberg#75504

Proposed changes:

• Bundle boot, theme and route in Jetpack Forms package.

TODO: move up to Jetpack config, this doesn't need to be forms specific.

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?
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Jetpack product discussion

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

Testing instructions:

• Go to '..'

[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 WoA dev 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 (Jetpack), and enable the update/bundle-more-core branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack update/bundle-more-core

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
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[github-actions]

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---

🔴 Action required: Please add missing changelog entries for the following projects: projects/packages/forms

Use the Jetpack CLI tool to generate changelog entries by running the following command: jetpack changelog add.
Guidelines: /docs/writing-a-good-changelog-entry.md

---

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[Copilot]

Pull request overview

This PR adds webpack bundling configuration for three @wordpress packages (boot, theme, and route) that are not yet available in WordPress core. This is a local alternative to an upstream Gutenberg change and ensures the wp-build dashboard can load independently of the Gutenberg plugin.

Changes:

• Configure webpack to bundle @wordpress/boot, @wordpress/theme, and @wordpress/route packages instead of treating them as external dependencies

[jp-launch-control]

Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

Full summary · PHP report · JS report

_{Coverage check overridden by I don't care about code coverage for this PR Use this label to ignore the check for insufficient code coveage. .}