Remove immediate sync check from ext_watchman.php test
Summary:
This seems to be the simplest cause of `ext_watchman.php` failures:
* https://our.intern.facebook.com/intern/testinfra/diagnostics/
3377699742425470.
281474985857212.
1584586577/
* https://our.intern.facebook.com/intern/testinfra/diagnostics/
6192449497039348.
281474985857212.
1584725653/
* https://our.intern.facebook.com/intern/testinfra/diagnostics/
3659174719153127.
281474985857212.
1584596326/
```
034+ FAIL
034- PASS
```
We're asking Watchman to respond within 1 millisecond, but Watchman doesn't guarantee sub-millisecond responses, even if we just completed a sync successfully. I think we should just remove this check.
Reviewed By: DavidSnider
Differential Revision:
D20572287
fbshipit-source-id:
e1b2085ab014a07de5deada275710fc5b3a44767