Expand globals test coverage in setUpDefaultReactNativeEnvironment-Globals-itest.js

[rubennorte]

Summary:
Expand the Fantom integration test for setUpDefaultReactNativeEnvironment globals so it covers the full set of globals that React Native's default environment is expected to install, not just the global-object aliases and __DEV__/NODE_ENV.

Reorganized the existing tests into nested describe blocks (global object, environment, JavaScript language features, Web APIs) and added coverage for:

• DOM: Node, Document, CharacterData, Text, Element, HTMLElement, HTMLCollection, NodeList.
• Geometry: DOMRect, DOMRectReadOnly, DOMRectList.
• Events: Event, EventTarget, CustomEvent.
• Performance: performance, Performance, PerformanceEntry, PerformanceMark, PerformanceMeasure, PerformanceObserver, PerformanceObserverEntryList, PerformanceEventTiming, PerformanceLongTaskTiming, PerformanceResourceTiming, EventCounts, TaskAttributionTiming.
• Timers and microtasks: setTimeout/clearTimeout, setInterval/clearInterval, setImmediate/clearImmediate, requestAnimationFrame/cancelAnimationFrame, requestIdleCallback/cancelIdleCallback, queueMicrotask.
• Networking: XMLHttpRequest, FormData, fetch, Headers, Request, Response, WebSocket, AbortController, AbortSignal, URL, URLSearchParams.
• File: Blob, File, and a presence-only check for FileReader (accessing the lazy getter triggers a native module that isn't available in the Fantom environment, so we assert the property is registered on globalThis without reading it).
• JavaScript language features: Promise.
• Other: alert, navigator.

PerformanceObserverEntryList and EventCounts aren't recognized as globals by Flow in this file, so they're declared via declare var ... : unknown at the top of the file and the assertion checks typeof.

Changelog: [Internal]

Differential Revision: D103224423

[meta-codesync]

@rubennorte has exported this pull request. If you are a Meta employee, you can view the originating Diff in D103224423.

[react-native-bot]

This pull request was successfully merged by @rubennorte in a3906b6

^{When will my fix make it into a release? | How to file a pick request?}

[meta-codesync]

This pull request has been merged in a3906b6.