Introduce provideWidgets utility

[aaemnnosttv]

Feature Description

A new utility should be introduced for the purpose of providing all default/core widget registrations while allowing for overrides as per our convention.

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Acceptance criteria

• A new provideWidgets utility should be introduced in tests/js/utils that follows our conventions with the following signature:

provideWidgets( registry: WPDataRegistry, extraData: Object[] = [] ) : void

• It should register all widgets and widget areas as per its registerDefaults while allowing for overrides & additions via extraData

Implementation Brief

Test Coverage

QA Brief

Changelog entry