* Remove mountWithStore enzyme component wrapper in favor for renderWithProvider testing-library/react for tests
Change dropdown component tests to testing-library/react
* Add react-testing-library
Adds react-testing-library as a dependency, creates a wrapper function with Provider store/I18n context support, and implements it in unconnected-account-alert.
* Refactor renderWithProvider store to extra param, instead of component prop store
These two functions were not especially useful. `tOrDefault` was used
only by `tOrKey`, and `tOrKey` was only used in one place. All it did
was return the given `key` directly if it was falsey, so it was easily
replaced by a condition.
* Various component tests and some conditional statements
Conditional in account-menu in removeAccount when keyring sometimes is not initially provideed
Conditional on unlock-page when there is no target.getBoundingClientRect on the element.
* Update helpers
* Remove component debugging
* Add default params for render helpers
* Remove stubComponent for old Mascot
Changes in https://github.com/MetaMask/metamask-extension/pull/7893 has prevented the need to stub it out.
Change logout to lock in account-menu test
* Use arrow property initializer functions
* Use pure components where applicable
* Add UNSAFE_ prefix for deprecated lifecycle hooks
* Add allow UNSAFE_
* Removed unused "Component"
* Replace boron with 'fade-modal'
* Upgrade react/no-deprecated to an error
* Paste react-tooltip-component source directly
* Use arrow functions to bind `this`
* Add UNSAFE_ prefix
* Update react-redux, react-router-dom
* Remove things from inlined 'fade-modal'
* Adjust mountWithRouter to get unit tests passing again
* Remove domkit
* Add Wrapper to render-helpers
* Upgrade @storybook/addon-knobs
