add unstable_isUnrecognizedActionError (#78933)
`unstable_isUnrecognizedActionError` is a new API that lets user code
check if a server action call failed because the action id wasn't
recognized by the server. This usually happens as a result of version
skew between client and server.
Example usage:
```ts
try {
await myServerAction();
} catch (err) {
if (unstable_isUnrecognizedActionError(err)) {
// The client is from a different deployment than the server.
// Reloading the page will fix this mismatch.
window.alert("Please refresh the page and try again");
return;
}
}
```
It can also be used to create a special error boundary, like we do in
the tests added here.
Note that this API is not a complete solution to this problem, as it
doesn't allow handling failures for MPA actions (sent without JS). We
might add a more complete API for this in the future to address that.
