Connection: improve connection info for multidomain setups

[bindlegirl]

Add connection information for multidomain sites.

Currently, I added these changes to My Jetpack.

Multidomain site when accessing My Jetpack from a secondary domain:

My Jetpack when site is in Safe Mode:

Proposed changes:

• Check the primay connected domain and compare it to the currently used one.
• If not in IDC, display information about the primary domain.
• Sites with only one domain will see no difference.
• Add Safe Mode notification to My Jetpack connection card.

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

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

Testing instructions:

• You need a site that's using two domains (JT site can be used).
• Use one domain to create the connection. Check the Connection card on My Jetpack page. It should look same as it does before applying this branch.
• Access My Jetpack using the secondary domain. It should look as in screenshot above.

[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:

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• ✅ Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
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[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 add/multidomain-cxn-info branch.

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

  bin/jetpack-downloader test jetpack add/multidomain-cxn-info
  

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]

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.

[bindlegirl]

After merging other planned changes to IDC and looking at logs, this doesn't seem like a good idea anymore. Closing.