Make native event type cache prototype-safe - #58203

Summary:

The EventTarget declarative-prop cache is an ordinary object, so event names such as constructor resolve inherited Object properties as cached entries and silently skip their registered handler. Use a typed Map for exact event-name keys and add a custom native direct-event regression.

Fixes #58202.

Changelog:

[GENERAL] [FIXED] - Resolve native EventTarget names that overlap Object prototype properties.

Test Plan:

• Exact baseline regression expected onConstructor and received undefined; fixed test passes 1/1.
• Focused Jest suite passed.
• Fresh yarn flow-check: 0 errors.
• Targeted ESLint, Prettier, and git diff --check passed.

No UI change; screenshots are not applicable.