fix(jest): mock getBoundingClientRect on host components in tests

[HarshitMadhav]

Summary:

Jest mocks for host components (MockNativeMethods, mockNativeComponent) exposed measure, measureInWindow, measureLayout, setNativeProps, focus, and blur, but not getBoundingClientRect. In production, ReadOnlyElement / ReactNativeElement implements getBoundingClientRect(); refs from react-test-renderer in unit tests therefore threw TypeError: getBoundingClientRect is not a function when user code called it (see #54916).

This change adds a getBoundingClientRect mock that returns a zero-valued DOMRect-like object (x, y, width, height, top, left, right, bottom), matching the fallback behavior when there is no native node. Tests were added for the mock helpers and for calling getBoundingClientRect on a mocked View ref via react-test-renderer.

Fixes #54916.

Changelog:

[INTERNAL] [FIXED] - Mock getBoundingClientRect on Jest host component refs so unit tests match ReadOnlyElement and no longer throw when calling ref.getBoundingClientRect().

Test Plan:

Ran:

yarn test packages/jest-preset/jest/__tests__/

All tests passed, including mockNativeMethods-test.js, getBoundingClientRect-test.js, and setup-test.js.

[react-native-bot]

This PR is stale because it has been open for 180 days with no activity. It will be closed in 7 days unless you comment on it or remove the "Stale" label.

[HarshitMadhav]

@react-native-bot review?