UI test target support #975
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Swift Testing is not compatible with UITest targets at the moment, but unfortunately `#if canImport` still returns `true`, making it difficult to ship libraries that provide tools for both `Testing` and `XCTest`, like the `assertSnapshot`. The previous workarounds we relied on have stopped working, and so we need a new approach. In this PR we have introduced a forwards-compatible `SnapshotUITesting` module that does not rely on any imports of `Testing` internally. We can then introduce Swift Testing support in the `SnapshotTesting` module, instead.
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When Snapshot Testing added Swift Testing support, it unfortunately broke the ability to use the library in UI test targets, which are incompatible with Swift Testing, and Apple does not appear provide the tools to statically bracket code in UI test targets.
To alleviate the issue, this PR divides Snapshot Testing functionality between a few modules so that a new
UISnapshotTestingtarget can be introduced and depended on instead.