Downgrade TurboModule crash to warning

Summary:
This is to address a UBN blocking FBiOSv300 rollout. A TM is attempting to invoke a promise more than once and crashing. We can't find the TM, so downgrading this to a warning to unblock the release.

Plan going forward:
- Replace this with some better logging to try and identify the culprit module.

Changelog: [Internal]

Reviewed By: RSNara

Differential Revision: D25539676

fbshipit-source-id: 5b75b71110eaa393378049de6e0d9a77e6328831

ReactCommon/react/nativemodule/core/platform/ios/RCTTurboModule.mm

@@ -244,7 +244,8 @@ static int32_t getUniqueId()
           }
 
           if (resolveWasCalled) {
-            throw std::runtime_error("Tried to resolve a promise more than once.");
+            RCTLogWarn(@"Tried to resolve a promise more than once.");
+            return;
           }
 
           auto strongResolveWrapper = weakResolveWrapper.lock();