Issue #3577056: Remove hex-encoding from JSON-LD output

Elena Chechulinarequested to merge
issue/schema_metatag-3577056:3577056-unnecessarily-hex-encoded-characters into 8.x-2.x

The JSON-LD URLs were being hex-encoded unnecessarily (e.g., \u0026 instead of &) due to extra json_encode flags. Removed the hex-encoding flags and now only use JSON_PRETTY_PRINT and JSON_UNESCAPED_UNICODE. The JSON is rendered using Markup::create() to prevent over-escaping in the <script> tag.

Closes #3577056

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