#7583574 SSH: Add ssh keys to SFTP card on atomic sites

Proposed Changes

New Card added to SFTP Hosting Card:

• Display user SSH keys
• Display site SSH keys
• Now users can:
  • Attach a site SSH Key
  • Detach a site SSH Key

Screenshots

Attaching detaching Atomic Site Keys

No user keys, Linking to /me/security

Testing Instructions

Atomic sites

• Sandbox D89601-code if not already deployed.
• Select an Atomic site on WPcom.
• Go to Settings > Hosting configuration, the URL is similar to /hosting-config/{site_url}.
• Scroll down to SSH Access and make sure the toggle is enabled.
• If your user doesn’t have an SSH key, you’ll read the sentence <a>Add an SSH key to your account</a> in order to use it with this site. , click on the link and add an ssh key generated using your computer or 1Password.
• Go back using the browser button to the hosting configuration.
• Observe a dropdown with only one item default is visible
• Click on Attach SSH key to site
• After a while, Observe the SSH details appear, and the attach form (select + attach button) is gone.
• Click on Detach in the SSH key details
• After a while, Observe the ssh key details disappear, and the attach form appears again.

This new sections is hidden by a feature flag hosting/ssh-keys and the SSH access should be enabled.

Simple sites

• Select a simple site on WPcom.
• Open the Network tab on Chrome Dev tools.
• Go to Settings > Hosting configuration
• Observe there are no requests made to any endpoint ending in ssh-keys.

Pre-merge Checklist

• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the “[Status] String Freeze” label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?

• Closes #68204