Issue 3655 swift testing part 2

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This converts AnalyzeErrorTests to Swift Testing.

It was a quite a bit more involved than expected, because override func invokeTest does not (yet) have an equivalent in Swift Testing. This should be possible with Swift 6.1.

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Not sure what's going on but the CI keeps failing. All tests pass locally but I can reproduce it on Linux in a dev container. The weird thing is that there's no test failure. It's just a script failure:

...
Test Suite 'WebpageSnapshotTests' passed at 2025-02-14 11:04:04.684
Executed 46 tests, with 0 failures (0 unexpected) in 5.162 (5.162) seconds
Test Suite S3StoreTests started
    ✔ test_Key_objectUrl (0.0 seconds)
    ✔ test_Key_path (0.0 seconds)
    ✔ test_Key_s3Uri (0.0 seconds)
Test Suite 'S3StoreTests' passed at 2025-02-14 11:04:04.685
Executed 3 tests, with 0 failures (0 unexpected) in 0.001 (0.001) seconds
Test Suite 'debug.xctest' passed at 2025-02-14 11:04:04.685
Executed 791 tests, with 20 tests skipped and 0 failures (0 unexpected) in 104.456 (104.456) seconds
Test Suite 'All tests' passed at 2025-02-14 11:04:04.685
Executed 791 tests, with 20 tests skipped and 0 failures (0 unexpected) in 104.456 (104.456) seconds
make: *** [Makefile:37: test] Error 1

Investigating.

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We need to drop xcbeautify. It's eating Swift Testing's output, plus Swift Testing has better test reporting, making it pretty much obsolete. The only downside is that until all tests are converted, we'll have the spammier XCTest reporting and no GH test failure reporting.

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Actually, we're way behind the latest release of 2.25.0 and there seems to be an update that handles Swift Testing output. Testing.

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D'oh, Swift Testing is running the tests in parallel by default. That's why this test conversion (the first one that's using the db) is failing in CI. My Xcode scheme was set to running them sequentially, that's why they passed there.

I'll set them to run --no-parallel until we've converted them all.