[6.2] Adopt SuspendingClock.systemEpoch.
#1206
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This PR adopts the new `systemEpoch` API added with [SE-0473](https://github.com/swiftlang/swift-evolution/blob/main/proposals/0473-clock-epochs.md). This API is back-deployed, so we don't need availability annotations on Darwin. It is not available with the 6.1 toolchain though, so the old `unsafeBitCast()` calls remain if building from source with a 6.1 toolchain. ### Checklist: - [x] Code and documentation should follow the style of the [Style Guide](https://github.com/apple/swift-testing/blob/main/Documentation/StyleGuide.md). - [x] If public symbols are renamed or modified, DocC references should be updated.
grynspan
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stmontgomery,
briancroom and
suzannaratcliff
as code owners
grynspan
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enhancement
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systemEpochconstant onSuspendingClockso that we don't have to useunsafeBitCast()to get an absolute value for a test timestamp.SuspendingClock.systemEpoch. #1202systemEpochis equivalent to ours.