TrigInDetEventTPCnv: Fix genconf warnings.

TPCnv libraries declare Gaudi plugin factories for the TP converters.
Normally, the TPCnv libraries should not be linked against libraries
other than the EventPool libraries.  However, it is possible for one
TPCnv library to link against another TPCnv library.
In that case, genconf may emit warnings that one library's factory
is visible from another.  Clean up by moving TPCnv factories into their
own libraries (linked against the corresponding TPCnv library).

Trigger/TrigEvent/TrigInDetEventTPCnv/CMakeLists.txt

-# Copyright (C) 2020, 2022 CERN for the benefit of the ATLAS collaboration
+# Copyright (C) 2020, 2022, 2024 CERN for the benefit of the ATLAS collaboration
 
 # Declare the package name:
 atlas_subdir( TrigInDetEventTPCnv )
 
 # Component(s) in the package:
-atlas_add_tpcnv_library( TrigInDetEventTPCnv
+atlas_add_library( TrigInDetEventTPCnv
    TrigInDetEventTPCnv/*.h src/*.cxx
    PUBLIC_HEADERS TrigInDetEventTPCnv
    LINK_LIBRARIES AthenaPoolCnvSvcLib AthenaPoolUtilities EventCommonTPCnv InDetIdentifier RootConversions StoreGateLib TrigCaloEventTPCnv TrigInDetEvent
    PRIVATE_LINK_LIBRARIES AthenaKernel IdDictParser )
 
+atlas_add_tpcnv_library( TrigInDetEventTPCnvFactories
+   src/factories/*.cxx
+   PUBLIC_HEADERS TrigInDetEventTPCnv
+   LINK_LIBRARIES TrigInDetEventTPCnv )
+
 atlas_add_dictionary( TrigInDetEventTPCnvDict
    TrigInDetEventTPCnv/TrigInDetEventTPCnvDict.h
    TrigInDetEventTPCnv/selection.xml