Fix/table interstitial loading buttons

[jboland88]

Proposed changes:

This PR updates the table interstitial screens in My Jetpack so that only one button shows in a "loading" state after being clicked instead of both buttons showing the loading icon (which is what happens now)

I chose the first approach that came to mind - if you spot another solution that would be better, let me know!

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

No

Testing instructions:

• Get a test site w/ Jetpack Beta - don't apply this PR yet to see the original issue
• Navigate to /wp-admin/admin.php?page=my-jetpack#/add-boost
• Click on "Start for free"
• Notice that both buttons show the loading spinner
• Now, with this PR applied, visit /wp-admin/admin.php?page=my-jetpack#/add-boost again
• This time, when you click "Start for free", only the button you clicked on should show the loading spinner

[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 fix/table-interstitial-loading-buttons branch.

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

  bin/jetpack-downloader test jetpack fix/table-interstitial-loading-buttons
  

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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[github-actions[bot]]

This PR has been marked as stale. This happened because:

• It has been inactive for the past 3 months.
• It hasn’t been labeled `[Pri] BLOCKER`, `[Pri] High`, etc.

If this PR is still useful, please do a [trunk merge or rebase](https://github.com/Automattic/jetpack/blob/trunk/docs/git-workflow.md#keeping-your-branch-up-to-date) and otherwise make sure it's up to date and has clear testing instructions. You may also want to ping possible reviewers in case they've forgotten about it. Please close this PR if you think it's not valid anymore — if you do, please add a brief explanation.

If the PR is not updated (or at least commented on) in another month, it will be automatically closed.

[github-actions[bot]]

This PR has been automatically closed as it has not been updated in some time. If you want to resume work on the PR, feel free to restore the branch and reopen the PR.