Disable Drake Visualizer on macOS

Drake Visualizer is disabled for at least as long as it takes to transition
Drake and VTK 8.2 to Python 3.9 or some alternative solution is found, see
RobotLocomotion#14650 for updates.

tools/workspace/drake_visualizer/drake_visualizer_bazel.py

@@ -12,6 +12,10 @@
 # or `bazel run`.
 sys.dont_write_bytecode = True  # noqa
 
+if sys.platform == "darwin":
+    print("ERROR: Drake Visualizer is disabled on macOS", file=sys.stderr)
+    sys.exit(0)
+
 from _drake_visualizer_builtin_scripts import (
     _exec_drake_visualizer_with_plugins,
 )

tools/workspace/drake_visualizer/drake_visualizer_installed.py.in

@@ -10,6 +10,10 @@ match that of the real `drake-visualizer` binary.
 from os.path import isdir, join, dirname, realpath
 import sys
 
+if sys.platform == "darwin":
+    print("ERROR: Drake Visualizer is disabled on macOS", file=sys.stderr)
+    sys.exit(0)
+
 # Ensure that we can import the necessary scripts, accommodating symlinks.
 PREFIX_DIR = dirname(dirname(realpath(__file__)))
 assert isdir(join(PREFIX_DIR, "bin")), f"Bad location: {PREFIX_DIR}"

tools/workspace/drake_visualizer/test/drake_visualizer_bazel_test.py

@@ -1,9 +1,12 @@
 from os.path import isfile
 import subprocess
+import sys
 import unittest
 
 
 class TestDrakeVisualizerBazel(unittest.TestCase):
+    @unittest.skipIf(sys.platform == "darwin",
+                     "Drake Visualizer is disabled on macOS")
     def test_help(self):
         """Ensure we can call drake_visualizer --help in Bazel."""
         bin_path = "tools/drake_visualizer"

tools/workspace/drake_visualizer/test/drake_visualizer_installed_test.py

@@ -1,10 +1,13 @@
 from os.path import join
+import sys
 import unittest
 
 import install_test_helper
 
 
 class TestDrakeVisualizerInstalled(unittest.TestCase):
+    @unittest.skipIf(sys.platform == "darwin",
+                     "Drake Visualizer is disabled on macOS")
     def test_help(self):
         """Ensures we can call `./bin/drake-visualizer --help` from install."""
         # Get install directory.