Guard JSGlobalContextSetInspectable behind a compile time check for Xcode 14.3+ (#39037)

Summary:
An earlier [change](8b1bf05) I made (that huntie resubmitted) only works on Xcode 14.3+ (See more info [here](react-native-community/discussions-and-proposals#687)). This change adds the appropriate compiler checks so that the change is compatible with Xcode 14.2 and earlier, and therefore cherry-pickable to 0.71 and 0.72.

The check works by checking if iOS 16.4+ is defined, which is the closest proxy I could find for "Is this Xcode 14.3".

## Changelog:

[IOS] [CHANGED] - Guard `JSGlobalContextSetInspectable` behind a compile time check for Xcode 14.3+

Pull Request resolved: #39037

Test Plan: I can't actually test on Xcode 14.2 (it won't launch on my MacBook 😢), but I made a similar [PR](microsoft#1848) in React Native macOS, whose CI checks run against Xcode 14.2 and I'm getting passing checks there.

Reviewed By: huntie

Differential Revision: D48414196

Pulled By: NickGerleman

fbshipit-source-id: ba10a6505dd11d982cc56c02bf9f7dcdc104bbec

Author: Saadnajmi

ReactCommon/jsc/JSCRuntime.cpp

@@ -300,6 +300,9 @@ class JSCRuntime : public jsi::Runtime {
 #if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_10_0
 #define _JSC_NO_ARRAY_BUFFERS
 #endif
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 160400
+#define _JSC_HAS_INSPECTABLE
+#endif
 #endif
 #if defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
 #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_11
@@ -397,7 +400,7 @@ JSCRuntime::JSCRuntime(JSGlobalContextRef ctx)
 #endif
 {
 #ifndef NDEBUG
-#ifdef TARGET_OS_MAC
+#ifdef _JSC_HAS_INSPECTABLE
   if (__builtin_available(macOS 13.3, iOS 16.4, tvOS 16.4, *)) {
     JSGlobalContextSetInspectable(ctx_, true);
   }