fix: report dataset provider errors as failing tests (#1749)

Errors raised while resolving a test's dataset (missing named dataset,
throwing dataset closure) previously crashed the whole run. Now the data
provider catches them, wraps them in a DatasetProviderError, and the test
method rethrows the original throwable so the affected test fails cleanly
with a non-zero exit code while other tests keep running.

tests/.tests/IssueOnly.php

@@ -0,0 +1,7 @@
+<?php
+
+declare(strict_types=1);
+
+it('references a missing dataset', function ($value) {
+    expect($value)->toBeTruthy();
+})->with('missing');