Output to bazel-bin instead of bazel-genfiles.

In the long term, all uses of bazel-genfiles will be replaced with bazel-bin. Starlark rules should only set `output_to_genfiles = True` when required for compatibility with other rules or tools that make assumptions about the location of output files.

Note that Bazel already defaults to `--incompatible_merge_genfiles_directory`, which makes the distinction moot anyway.

PiperOrigin-RevId: 612915158

third_party/flatbuffers/build_defs.bzl

@@ -364,7 +364,6 @@ _gen_flatbuffer_srcs = rule(
             cfg = "exec",
         ),
     },
-    output_to_genfiles = True,
 )
 
 def flatbuffer_py_strip_prefix_srcs(name, srcs = [], strip_prefix = ""):
@@ -407,7 +406,6 @@ _concat_flatbuffer_py_srcs = rule(
     attrs = {
         "deps": attr.label_list(mandatory = True),
     },
-    output_to_genfiles = True,
     outputs = {"out": "%{name}.py"},
 )