LaunchpadSaveModal: Update action href based on experiment variation

[bogiii]

Proposed changes:

The LaunchpadSaveModal component has hardcoded redirection to the fullscreen Launchpad onboarding step. With this change, we dynamically decide the redirection href based on the experiment or session storage item information.

The default behavior will remain the same if the experiment has not started.

Related Pull Request: Automattic/wp-calypso#93205

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

Related document: pbxNRc-3Yh-p2

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

No

Testing instructions:

• Create a new site or take an existing {SITE_SLUG}
• Apply PR changes to your sandbox and proxy your {SITE_SLUG}
• Go to {SITE_SLUG}/wp-admin/site-editor.php?calypso_origin=http%3A%2F%2Fcalypso.localhost%3A3000&canvas=edit&assembler=1&showLaunchpad=true
• In the developer tool, execute the command: window.sessionStorage.setItem( 'launchpad_removal_2024_experiment_variation', 'treatment' );
• Make any content change
• Press "Save" button
• In "Great progress!" modal, press on the "Next steps" button
• Check if the "Next steps" button has href: https://jetpack.com/redirect/?source=calypso-home&site=launchpadtesting1.wordpress.com

[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 update/wpcom-launchpad-setup-redirection 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 update/wpcom-launchpad-setup-redirection
  

  bin/jetpack-downloader test jetpack-mu-wpcom-plugin update/wpcom-launchpad-setup-redirection
  

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, ...).
  
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Jetpack plugin:

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• WordPress.com Simple releases happen semi-continuously (PCYsg-Jjm-p2).
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[ouikhuan]

Works as expected, thanks for working on this!

[daledupreez]

The changes in this PR look OK to me based on inspection.