Detox v21 Breaking Changes

[d4vidi]

TODO: Consider switching context of all of this to Detox v22.

• Remove explicit user-facing error regarding attempt of importing jest-internals from detox/runners/jest-circus/ rather than detox/runners/jest/ (see build: move jest-circus/ facade to jest/ #3400)
• Web views: add more actions on web-view root frame. #3752: Reconsider the context of some web API's, for example: getCurrentUrl, runScript(), getTitle(). They are currently associated with screen elements, and should probably resides at the top (i.e. device) level.
• by.label() and by.accessibilityLabel are redundant. The latter should be deprecated and removed.

[d4vidi]

@noomorph I think it's time to paste the leftovers from v20