Remove dead file-local typedef RCTJSCSetOptionType in RCTPerfMonitor

Summary:
`RCTJSCSetOptionType` was a file-local `using` alias (`BOOL (*)(const char *)`) in `RCTPerfMonitor.mm` that was never referenced. The concrete `RCTJSCSetOption` function is called directly at its two call sites; no code ever used the function-pointer typedef. This removes the dead alias.

Changelog: [Internal]

Differential Revision: D108012902

Author: sammy-SC

packages/react-native/React/CoreModules/RCTPerfMonitor.mm

@@ -39,8 +39,6 @@
 static const CGFloat RCTPerfMonitorBarHeight = 50;
 static const CGFloat RCTPerfMonitorExpandHeight = 250;
 
-using RCTJSCSetOptionType = BOOL (*)(const char *);
-
 NSArray<NSString *> *LabelsForRCTPerformanceLoggerTags();
 
 static BOOL RCTJSCSetOption(const char *option)