[test] don't filter out the fuzzer tests

fuzzer testsuite tests are not run due to a missing subclass method '_should_filter_by_name' in fuzzer/testcfg.py

This CL fixes the filtering for the 'fuzzer' testsuite

R=machenbach@chromium.org

Bug: v8:10770
Change-Id: I9a4b0e0c6c79f4b525ee284df343acccc965f732
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2336802
Auto-Submit: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69235}

test/fuzzer/testcfg.py

@@ -32,6 +32,8 @@ class TestLoader(testsuite.GenericTestLoader):
   def _to_relpath(self, abspath, _):
     return os.path.relpath(abspath, self.suite.root)
 
+  def _should_filter_by_name(self, _):
+    return False
 
 class TestSuite(testsuite.TestSuite):
   def _test_loader_class(self):