Avoid using string replacement on a bogus string to get the relative directory of this test.

flutter/engine#46911 will fix the behavior of Platform.script so it actually has the file being executed, but that will not be the file the test author wrote, it will be `listener.dart.dill` generated by tool code and running in a temp directory for this particular test.

We may want to come up with a more robust way of providing the test for framework test users, but we should do so in a way that will not limit the ability to run multiple tests in a single process if that offers performance benefits.

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This reverts commit b14d346.

With flutter#46911, the Platform.script API
will return a URI for the compiled temporary wrapper script generated by
"flutter test".  This will cause issues for tests that expect Platform.script
to reflect the directory where "flutter test" was launched.

This reverts commit b14d346.

With #46911, the Platform.script API will return a URI for the compiled temporary wrapper script generated by "flutter test".  This will cause issues for tests that expect Platform.script to reflect the directory where "flutter test" was launched.

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flutter/engine@2d55e29...2159fdb

2023-10-17 [email protected] Roll Skia from 751358929d1f to 205b728a8623 (1 revision) (flutter/engine#46982)
2023-10-17 [email protected] Revert "Fix `Platform.script` for flutter_tester" (flutter/engine#46981)
2023-10-16 [email protected] Roll Dart SDK from 12f6559bd6ed to f3e1cd38e8b0 (1 revision) (flutter/engine#46977)
2023-10-16 [email protected] Roll Fuchsia Linux SDK from 6E-cSq679DjzBMcqY... to Y9mDBoH4BSC6pWFXV... (flutter/engine#46974)
2023-10-16 [email protected] Roll Skia from 8919fecf15c1 to 751358929d1f (4 revisions) (flutter/engine#46972)
2023-10-16 [email protected] [Impeller] GPUTracer for Metal. (flutter/engine#46846)
2023-10-16 [email protected] Fix `Platform.script` for flutter_tester (flutter/engine#46911)
2023-10-16 [email protected] Roll Skia from 85c8dca08cbe to 8919fecf15c1 (1 revision) (flutter/engine#46966)

Also rolling transitive DEPS:
  fuchsia/sdk/core/linux-amd64 from 6E-cSq679Djz to Y9mDBoH4BSC6

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This addresses the problem in flutter/flutter#12847 which changed slightly over time.

Today, `Platform.script` does not give an empty `file` URI, it gives something like `file://path/to/package/main.dart` _regardless of how the file is actually named_.

After this change, it will give the absolute path to the file being run under test.

So before this change, the new test would have a URI like

```
file:///Users/dnfield/src/flutter/engine/src/main.dart
```

And now it has

```
file:///Users/dnfield/src/flutter/engine/src/out/host_debug_unopt_arm64/gen/platform_test.dart.dill
```

This is going to be helpful in generating relative paths from the test file.

This reverts commit b14d346.

With #46911, the Platform.script API will return a URI for the compiled temporary wrapper script generated by "flutter test".  This will cause issues for tests that expect Platform.script to reflect the directory where "flutter test" was launched.