[pull] main from facebook:main #255
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When the debug channel was already closed, we must not try to close it
again when the Response gets garbage collected.
**Test plan:**
1. reduce the Flight fixture `App` component to a minimum [^1]
- remove everything from `<body>`
- delete the `console.log` statement
2. open the app in Firefox (seems to have a more aggressive GC strategy)
3. wait a few seconds
On `main`, you will see the following error in the browser console:
```
TypeError: Can not close stream after closing or error
```
With this change, the error is gone.
[^1]: It's a bit concerning that step 1 is needed to reproduce the
issue. Either GC is behaving differently with the unmodified App, or we
may hold on to the Response under certain conditions, potentially
creating a memory leak. This needs further investigation.
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