fix(engine-dom): allow FACE in synthetic lifecycle

[nolanlawson]

Details

Fixes #4251. Allows components to use FACE (Form Associated Custom Element) callbacks even when running in synthetic lifecycle mode.

This also adds tests for the DISABLE_NATIVE_CUSTOM_ELEMENT_LIFECYCLE flag just to make sure everything works correctly even when that flag is enabled.

Does this pull request introduce a breaking change?

• 😮‍💨 No, it does not introduce a breaking change.

Does this pull request introduce an observable change?

• 🤞 No, it does not introduce an observable change.