HPCC-32961 OwnedSpanScope assignment causes early span end

- Added OwnedSpanScope assignment operator for ISpan*
- Deleted OwnedSpanScope copy constructor and assignment operator

Signed-off-by: James McMullan James.McMullan@lexisnexis.com

system/jlib/jtrace.hpp

@@ -164,11 +164,17 @@ class jlib_decl OwnedSpanScope
 public:
     OwnedSpanScope() = default;
     OwnedSpanScope(ISpan * _ptr);
+    OwnedSpanScope(const OwnedSpanScope& rhs) = delete;
+    OwnedSpanScope(OwnedSpanScope&& rhs) = default;
     ~OwnedSpanScope();
 
     inline ISpan * operator -> () const         { return span; }
     inline operator ISpan *() const             { return span; }
 
+    inline OwnedSpanScope& operator=(ISpan * ptr) = delete;
+    inline OwnedSpanScope& operator=(const OwnedSpanScope& rhs) = delete;
+    inline OwnedSpanScope& operator=(OwnedSpanScope&& rhs) = default;
+
     void clear();
     ISpan * query() const { return span; }
     void set(ISpan * _span);