run_plugin_tests: --skip-setup option installs irods-python-ci-utilities

[alanking]

And it's annoying.

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This is because --skip-setup isn't reaching the test hook at all. The run_plugin_tests script does not pass along this option through the options here:

irods_testing_environment/run_plugin_tests.py

Lines 109 to 116 in 56e7c81

	options = ['--built_packages_root_directory', plugin_package_directory]
	rc = test_utils.run_plugin_tests(containers,
	args.plugin_name,
	args.test_hook,
	args.tests,
	[options] * args.executor_count,
	args.fail_fast)