GHA setup-linux should always be pair with teardown-linux (#103216)
This explains the existence of a running container `pytorch-linux-focal-py3.8-gcc7`. For example, https://github.com/pytorch/pytorch/actions/runs/5138349666/jobs/9344366066 on `i-097fac5d9b9bef249`. The immediate job running before on this runner was a doc build jobs:
```
{
"name": "linux-docs / build-docs-functorch-false",
"html_url": "https://github.com/pytorch/pytorch/actions/runs/5184821352/jobs/9344262329",
"_event_time": "2023-06-06T05:21:23.569553Z",
"runner_name": "i-097fac5d9b9bef249",
"head_branch": "gh/titaiwangms/25/head",
"head_sha": "5d48fd183875e4eea44a94df239eae356e852939",
"workflow_name": "pull",
"conclusion": "success",
"line": null
}
```
This might be related to OOM issue happening on these runners.
Thoughts:
* May be we should have a linter for this to make sure that GHA setup-OS always pairs with teardown-OS
* Nova GHA `setup-linux` is updated by https://github.com/pytorch/test-infra/pull/4275
Pull Request resolved: https://github.com/pytorch/pytorch/pull/103216
Approved by: https://github.com/malfet, https://github.com/ZainRizvi, https://github.com/atalman
