Equivalent to #1671 but for unit tests.
In iOS 16 (as of beta 1), the receipt persists across tests, despite the use of `SKTestSession.resetToDefaultState`.
This might also help with flaky tests pre-iOS 16 too.
Also note that I fixed this method in `BaseBackendIntegrationTests`. Using `URL.absoluteString` was incorrect there, so the file was probably never deleted.
I filed a feedback (FB10252944) for this:
* Resolves [CF-443]
* Adds `configureWithConfiguration` to `RCPurchasesAPI.m`
* Create Configuration object and API to configure Purchases
* Update API doc for new Purchases API
* Add example code to Configuration documentation
* Adds deprecations for various Purchases.configure methods
## Motivation:
There is no way to run code statically like in Obj-C using `+ [NSObject initialize]`, so this ensures (through a new `SwiftLint` rule) that all test classes inherit this common test class instead of `XCTestCase` directly.
A future PR will make use of this new `CIRCLECI_TESTS_GENERATE_SNAPSHOTS` environment variable to allow regenerating snapshots in CI.
I've also moved the duplicated `CurrentTestCaseTracker` usages to a single point.
* moved test suites to Tests folder
* fixed outdated path
* fixed more outdated paths
* moved TestsPlans to Tests folder
* update path to Constants.swift
NachoSoto
