feat: add aws inf2 instance type as named resources

[HanFa]

Add aws inf2 instance to named resources

Test plan:

/Users/hanfange/workspace/torchx/venv/bin/python /Users/hanfange/Applications/PyCharm Professional Edition.app/Contents/plugins/python-ce/helpers/pycharm/_jb_unittest_runner.py --target named_resources_aws_test.NamedResourcesTest.test_aws_inf2 

Ran 1 test in 0.001s

OK

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[kiukchung]

LGTM thanks for the contribution! could you fix the linter error?

[HanFa]

Thanks @kiukchung , I have updated the PR to fix the linting error. Could we retry the linting?

[HanFa]

Run lintrunner -a to do the linting, could we retry the lint?

[tonykao8080]

looks good

[HanFa]

@tonykao8080 could you check if we can merge this change? I don't think the doc build is a related blocker.