message: [test] fix flag in codec test new/legacy
  Commit Message: fix runtime flag override in tests. There was a mistake that codec_impl_test for H/2 tested legacy and codec_impl_legacy_test tested new codec. Swap back so codec tests new, legacy tests legacy.
  Risk Level: Low
diff: @@ -40,6 +40,10 @@ CODEC_TEST_DEPS = [
  envoy_cc_test(
  name = "codec_impl_test",
  srcs = ["codec_impl_test.cc"],
  + # The default codec is the legacy codec. Override runtime flag for testing new codec.
  + args = [
  + "--runtime-feature-override-for-tests=envoy.reloadable_features.new_codec_behavior",
  + ],
  shard_count = 5,
  tags = ["fails_on_windows"],
  deps = CODEC_TEST_DEPS,
  @@ -48,8 +52,9 @@ envoy_cc_test(
  envoy_cc_test(
  name = "codec_impl_legacy_test",
  srcs = ["codec_impl_test.cc"],
  + # The default codec is the legacy codec. Verify the runtime flag for the new codec is disabled.
  args = [
  - "--runtime-feature-override-for-tests=envoy.reloadable_features.new_codec_behavior",
  + "--runtime-feature-disable-for-tests=envoy.reloadable_features.new_codec_behavior",
  ],
  shard_count = 5,
  tags = ["fails_on_windows"],
  