AI Client: make fetch error retry optional

[CGastrell]

Related to #39846

Proposed changes:

This PR will turn onReload prop to optional as we cancel the handler from Jetpack AI.

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)?

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

No

Testing instructions:

Sandbox the public API, but don't connect to the sandbox so the fetch for AI feature fails. Insert a logo generator on the editor and use the AI toolbar button to open the generator modal.

See the error notice modal doesn't offer a "Try again" button and the instructions state to reload the page as opposed to use the "Try again" button.

Then connect to sandbox to get actual responses from the endpoint. No need to reload, you can call wp.data.dispatch('jetpack-ai/logo-generator').fetchAiAssistantFeature() and the component should update (maybe close and re-open modal between fetch calls).

Try different plans/cases and open and close the modal to confirm it's consistent. You can use this snippet p1729593811040589-slack-C02TQF5VAJD and call

[github-actions[bot]]

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 change/jetpack-ai-fetch-error-retry-optional branch.

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

  bin/jetpack-downloader test jetpack change/jetpack-ai-fetch-error-retry-optional
  

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[bot]]

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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