[lldb] Override Should{Select,Show} in StopReasonBreakpoint (llvm#135637)

This is necessary so that LLDB does not select (or show the stop reason
for) a thread which stopped at an internal breakpoint.

Other than manual testing/inspection, which I've done, this does not
seem to lend itself to API testing, as we cannot set internal
breakpoints through the SBAPI.

(cherry picked from commit 7491ff7)

Author: felipepiovezan

lldb/source/Target/StopInfo.cpp

@@ -263,6 +263,10 @@ class StopInfoBreakpoint : public StopInfo {
     return bp_site_sp->GetSuggestedStackFrameIndex();
   }
 
+  bool ShouldShow() const override { return !m_was_all_internal; }
+
+  bool ShouldSelect() const override { return !m_was_all_internal; }
+
 protected:
   bool ShouldStop(Event *event_ptr) override {
     // This just reports the work done by PerformAction or the synchronous