Duck Player Custom Error

[mgurgel]

Task/Issue URL: https://app.asana.com/0/1206594217596623/1209151829557390

Description:

Shows a custom error screen when Duck Player detects an error message in the YouTube embed

Steps to test this PR:

1. In the debug menu, override privacy config to https://www.jsonblob.com/api/jsonBlob/1339986121966411776
2. Follow the steps here: https://app.asana.com/0/1142021229838617/1209392401656236

<!—
Before submitting a PR, please ensure you have tested the combinations you expect the reviewer to test, then delete configurations you know do not need explicit testing.

Using a simulator where a physical device is unavailable is acceptable.
—>

Definition of Done (Internal Only):

• Does this PR satisfy our Definition of Done?

Copy Testing:

• Use of correct apostrophes in new copy, ie ’ rather than ’

Orientation Testing:

• Portrait
• Landscape

Device Testing:

• iPhone SE (1st Gen)
• iPhone 8
• iPhone X
• iPhone 14 Pro
• iPad

OS Testing:

• iOS 15
• iOS 16
• iOS 17

Theme Testing:

• Light theme
• Dark theme

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Internal references:

Software Engineering Expectations
Technical Design Template

[mgurgel]

Closed in favor of duckduckgo/apple-browsers#23