Reduce the threshold for assuming that the corpus test population fai…

…led in some fatal way.

Commit [b6e8040](cedar-policy/cedar-integration-tests@b6e8040) reduced the size of the tgz file by 25%, which was the likely culprit in reducing the size of the test suite.

integration_tests/corpus_test.go

@@ -74,8 +74,8 @@ func TestCorpus(t *testing.T) {
 		return "tmp/" + v
 	}
 
-	// detect possible corpus data pipeline failure
-	if len(tests) < 4_000 {
+	// detect possible corpus data pipeline failure. As of 2024/07/02, there were 1982 tests.
+	if len(tests) < 100 {
 		t.Fatalf("corpus test count too low: %v", len(tests))
 	}