Improve getaddrinfo Error Message

Sometimes users get the following error message:

I tried searching the imagify-plugin and imagify repos, but found no mention of this error, so I assume it's a message coming from the server. Do we know specifically why these errors happen?

It's definitely not clear to the users from the current error message why the error is happening or what to do about it.

In some cases, this is resolved by having users log out and log back in:

https://secure.helpscout.net/conversation/1346912386/215251
https://secure.helpscout.net/conversation/1341841336/213392

In others, we see users getting cURL error 28's:

https://secure.helpscout.net/conversation/1372646588/224792
https://secure.helpscout.net/conversation/1645552341/297931

Instead, we could offer a more helpful message linking to either Optimization is Stuck or a new page for this specific error. Possibly something like:

<strong>A server error occured during optimization: <a href="https://imagify.io/documentation/optimization-is-stuck/" rel="noopener" target="_blank">More info and possible solutions</a></strong>

Though it could be a bit different / more descriptive based on the reason why these errors occur.

Start by locating the plugin's handling of getaddrinfo and cURL error 28 responses, then review the Optimization is Stuck documentation linked in the issue. Done means users receive a clearer optimization error message with a relevant link and guidance for these failures.