External media: Show connection upgrade screen in transition from Photos to Picker

[bogiii]

Proposed changes:

• Created GooglePhotosAuthUpgrade component
• Catch the error when a connection is not valid and show the upgrade screen
• Adjust the GooglePhotosAuth style, reducing the margin around the paragraphs

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

pdtkmj-36s-p2#comment-5923

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

Testing instructions:

• Make sure that your Google Photos connection is established
• Turn ON google-photos-picker feature
• Go to post/page editor and choose image block
• Select Google Photos
• Check if you see a connection Upgrade screen

Before	After

[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/external-media-google-photos-picker-4 branch.

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

  bin/jetpack-downloader test jetpack update/external-media-google-photos-picker-4
  

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[github-actions]

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[bogiii]

The PR has been updated to handle recent changes when the endpoint is unavailable and returns status 404.

It is ready for review: @ouikhuan

[ouikhuan]

In my latest test, it looks like the COOKIE won't be stored anymore, but if I understand correctly the PR has been rebased and your previous changes should be included, right?

[ouikhuan]

Tested the following scenario and everything works as expected:

• Old connection, with new picker feature on
• Old connection, with picker feature flag off
• New connection with picker feature flag on
• New connection, with picker feature flag off

Great work!