The `assert` module has two modes: "Legacy" and "strict". When using
strict mode, the "strict" version of each assertion method is implied.
Whereas in legacy mode, by default it will use the deprecated, "loose"
version of each assertion.
We now use strict mode everywhere. A few tests required updates where
they were asserting the wrong thing, and it was passing beforehand due
to the loose matching.
* Remove periodic calls to the /featureFlag API
* Always show the Swap button on the main page
* Check if the Swaps feature is enabled, show loading animation while waiting
* Reuse an existing useEffect call
* Use ‘isFeatureFlagLoaded’ in React’s state, resolve lint issues
* Add a watch mode for Jest testing
* Add unit tests for Swaps: fetchSwapsLiveness, add /ducks/swaps into Jest testing
* Remove Swaps Jest tests from Mocha’s ESLint rules
* Ignore Swaps Jest tests while running Mocha, update paths
* Increase test coverage to the current max
* Fix ESLint issues for Swaps
* Enable the Swaps feature by default and after state reset, remove loading screen before seeing Swaps
* Update Jest config, fix tests
* Update Jest coverage threshold to the current maximum
* Update ESLint rule in jest.config.js
* Disable the “Review Swap” button if the feature flag hasn’t loaded yet
* Update jest threshold
* Swaps support for local testnet
* Create util method for comparison of token addresses/symbols to default swaps token
* Get chainId from txMeta in _trackSwapsMetrics of transaction controller
* Add comment to document purpose of getTransactionGroupRecipientAddressFilter
* Use isSwapsDefaultTokenSymbol in place of repeated defaultTokenSymbol comparisons in build-quote.js
