wpt: use wpt-runner-types crate for META and fuzzy parsing

[nicoburns]

Summary

Switches the WPT runner to the new wpt-runner-types crate (nicoburns/wpt-rs#4), which upstreams the // META: comment parsing and reftest fuzziness parsing with more rigour:

• js_wrapper.rs now consumes parse_script_metadata() / ScriptMetadata (typed directives incl. global as GlobalScope with upstream's full keyword set and worker/shadowrealm longhand expansion). js_test_has_window_variant is now global_scopes().contains(&GlobalScope::Window) — note this also matches upstream's default of {window, dedicatedworker} when no global= is present.
• fuzzy.rs keeps only the HTML <meta name=fuzzy> scraping and the RGBA buffer diff; the content-value parsing (FuzzySpec: FromStr with structured errors, tolerance_for_reference) moves upstream. The new parser is stricter (rejects unknown/duplicate properties and wrong part counts like upstream's manifest code) and additionally supports named args in either order.

Draft until nicoburns/wpt-rs#4 merges and wpt-runner-types is published — currently pinned as a git dependency (rev = 961f8b9); should be switched to a crates.io version before merging.

Link to Devin session: https://dioxus.staging.devinenterprise.com/sessions/13db5150cbcd480b86567637ec411a82
Open in Devin Desktop: https://dioxus.staging.devinenterprise.com/desktop/session/13db5150cbcd480b86567637ec411a82?variant=devin-insiders
Requested by: @nicoburns

WPT results

No changes in test results compared to main.

_{Generated by the WPT workflow.}

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