Add FXIOS-11322 #24638 [WebEngine] Native error page handling

[lmarceau]

📜 Tickets

Jira ticket
Github issue

💡 Description

First pass at integrating native error pages inside the WebEngine. This is bascially using the same pattern as in production, but removing the html handling part of it since we want to only support native error pages in the WebEngine. The native error page is shown in the browser. We might need to pass in more information at a later point since not all native error pages are created at the moment. But this simplifies the code paths a bit.

Also needed to fix the SampleBrowser project with latest changes in sub-packages (namely the state were renamed to configuration).

📝 Checklist

You have to check all boxes before merging

• Filled in the above information (tickets numbers and description of your work)
• Updated the PR name to follow our PR naming guidelines
• Wrote unit tests and/or ensured the tests suite is passing
• When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
• If needed, I updated documentation / comments for complex code and public methods
• If needed, added a backport comment (example @Mergifyio backport release/v120)

[mattreaganmozilla]

Nothing major jumped out, lgtm 👍