runtime: use runtime.AddCleanup in the standard library

[cagedmantis]

AddCleanup has been added to the runtime (#67535). We should use runtime.AddCleanup instead of runtime.SetFinalizer in the standard library wherever it is possible.

@mknyszek

[gabyhelp]

Related Issues

• runtime: deprecate SetFinalizer #70425

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[gopherbot]

Change https://go.dev/cl/638555 mentions this issue: os: use AddCleanup to close files

[gopherbot]

Change https://go.dev/cl/638557 mentions this issue: net: use runtime.AddCleanup instead of runtime.SetFinalizer

[gopherbot]

Change https://go.dev/cl/638556 mentions this issue: io: use runtime.AddCleanup instead of runtime.SetFinalizer

[gopherbot]

Change https://go.dev/cl/638578 mentions this issue: os: simplify process status

[gopherbot]

Change https://go.dev/cl/638576 mentions this issue: os: remove Process.mode field

[gopherbot]

Change https://go.dev/cl/638579 mentions this issue: os: use AddCleanup, not SetFinalizer, for Process

[gopherbot]

Change https://go.dev/cl/638575 mentions this issue: os: separate Process.handle into a separate memory allocation

[gopherbot]

Change https://go.dev/cl/638577 mentions this issue: os: don't store reference count in Process.state