remove code and packages unneeded in Run 3. ATR-22797

...etTrigRecExample/python/InDetTrigConfigRecBackTracking.py

...DetTrigRecExample/python/InDetTrigConfigRecNewTracking.py

...TrigRecExample/python/InDetTrigConfigRecPostProcessing.py

...tTrigRecExample/python/InDetTrigConfigRecPreProcessing.py

...e/InDetTrigRecExample/python/InDetTrigRecLowPtTracking.py

.../InDetTrigRecAlgs/InDetTrigAmbiguitySolver/CMakeLists.txt

...Solver/InDetTrigAmbiguitySolver/ATLAS_CHECK_THREAD_SAFETY

...olver/InDetTrigAmbiguitySolver/InDetTrigAmbiguitySolver.h

...nDetTrigRecAlgs/InDetTrigAmbiguitySolver/doc/packagedoc.h

...iguitySolver/python/InDetTrigAmbiguitySolverMonitoring.py

...InDetTrigAmbiguitySolver/src/InDetTrigAmbiguitySolver.cxx

...olver/src/components/InDetTrigAmbiguitySolver_entries.cxx

.../InDetTrigRecAlgs/InDetTrigExtensProcessor/CMakeLists.txt

...cessor/InDetTrigExtensProcessor/ATLAS_CHECK_THREAD_SAFETY

...essor/InDetTrigExtensProcessor/InDetTrigExtensProcessor.h

...nDetTrigRecAlgs/InDetTrigExtensProcessor/doc/packagedoc.h

...ensProcessor/python/InDetTrigExtensProcessorMonitoring.py

...InDetTrigExtensProcessor/src/InDetTrigExtensProcessor.cxx

...essor/src/components/InDetTrigExtensProcessor_entries.cxx

...nDetTrigRecAlgs/InDetTrigPrepRawDataFormat/CMakeLists.txt