Fix UBSan float-cast-overflow in BridgingTest.numberTest (#56693)

Summary:

Changelog:
[Internal] - Remove UB-relying assertion from BridgingTest.numberTest

UndefinedBehaviorSanitizer: float-cast-overflow xplat/js/react-native-github/packages/react-native/ReactCommon/react/bridging/tests/BridgingTest.cpp:73:3

Test was never completed. The test process might have crashed.
Buck UI: https://www.internalfb.com/buck2/0e81623b-a566-4181-a630-633a9b0144f5
Test UI: https://www.internalfb.com/intern/testinfra/testrun/22236523178966589
Network: Up: 18KiB  Down: 19KiB  (reSessionID-47fd7d68-411c-4457-bd30-9da43be7bd6e)
Loading targets.     Remaining     0/71                                                                                                                                                    1705 dirs read, 2636 targets declared
Analyzing targets.   Remaining     0/699                                                                                                                                                   23626 actions, 35339 artifacts declared
Executing actions.   Remaining     0/4161                                                                                                                                                  37:55.2s exec time total
Command: test.     Finished 1 local, 1256 cache (99% hit)                                                                                                                                  37:49.9s exec time cached (99%)                                      
Time elapsed: 8.6s
Buck UI: https://www.internalfb.com/buck2/0e81623b-a566-4181-a630-633a9b0144f5
Tests finished: Pass 23. Fail 1. Timeout 0. Fatal 0. Skip 0. Omit 0. Infra Failure 0. Build failure 0
1 TESTS FAILED
  ✗ fbsource//xplat/js/react-native-github/packages/react-native/ReactCommon/react/bridging:tests - BridgingTest.numberTest

Run $ fdb buck test <args> to debug fbsource//xplat/js/react-native-github/packages/react-native/ReactCommon/react/bridging:tests - BridgingTest.numberTest
      ^^^ just prefix your previous command! ($ fdb !!)
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[chpurrer@166047.od /data/sandcastle/boxes/fbsource (b6d9fba9d4)]$ 
```

Reviewed By: shwanton

Differential Revision: D103954447

Author: christophpurrer

packages/react-native/ReactCommon/react/bridging/tests/BridgingTest.cpp

@@ -69,11 +69,6 @@ TEST_F(BridgingTest, numberTest) {
       -42,
       static_cast<uint32_t>(
           bridging::toJs(rt, static_cast<uint32_t>(-42)).asNumber()));
-
-  EXPECT_FALSE(
-      -42 ==
-      static_cast<int32_t>(
-          bridging::toJs(rt, static_cast<uint32_t>(-42)).asNumber()));
 }
 
 TEST_F(BridgingTest, stringTest) {