[autoscaler] Better validation for min_workers and max_workers

[AmeerHajAli]

closes #13775 reported by Ed.

Checks

• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested :(

[AmeerHajAli]

@ericl, can you please merge?

[simon-mo]

Reverting this PR because it consistently fail on Windows, please re-revert once you fix windows build.

================================== FAILURES ===================================
________ AutoscalingConfigTest.testValidateDefaultConfigMinMaxWorkers _________

self = <com_github_ray_project_ray.python.ray.tests.test_autoscaler_yaml.AutoscalingConfigTest testMethod=testValidateDefaultConfigMinMaxWorkers>

    def testValidateDefaultConfigMinMaxWorkers(self):
        aws_config_path = os.path.join(
            RAY_PATH, "autoscaler/aws/example-multi-node-type.yaml")
>       with open(aws_config_path) as f:
E       OSError: [Errno 22] Invalid argument: '\\\\?\\C:\\Users\\RUNNER~1\\AppData\\Local\\Temp\\Bazel.runfiles_6y4y9g7o\\runfiles\\com_github_ray_project_ray\\python\\ray\\autoscaler/aws/example-multi-node-type.yaml'

\\?\C:\Users\RUNNER~1\AppData\Local\Temp\Bazel.runfiles_6y4y9g7o\runfiles\com_github_ray_project_ray\python\ray\tests\test_autoscaler_yaml.py:51: OSError