LibCore+Ladybird: Extract helper into generic Process::is_being_debugged

Author: https://github.com/SebastianZaha
Commit: 216667368d
Pull-request: https://github.com/SerenityOS/serenity/pull/20327
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/AtkinsSJ

Userland/Libraries/LibCore/Process.h

@@ -30,6 +30,8 @@ public:
         Yes,
     };
     static ErrorOr<void> set_name(StringView, SetThreadName = SetThreadName::No);
+
+    static ErrorOr<bool> is_being_debugged();
 };
 
 }