replace some API components with references

unittests/tmtcservices/CMakeLists.txt

@@ -1,2 +1,3 @@
 target_sources(${FSFW_TEST_TGT} PRIVATE
+  testStoreHelper.cpp
 )

unittests/tmtcservices/testStoreHelper.cpp

@@ -2,9 +2,11 @@
 
 #include "fsfw/storagemanager/LocalPool.h"
 #include "fsfw/tmtcservices/TmStoreHelper.h"
+#include "mocks/CdsShortTimestamperMock.h"
 
 TEST_CASE("TM Store Helper", "[tm-store-helper]") {
+  auto timeStamper = CdsShortTimestamperMock();
   LocalPool::LocalPoolConfig cfg = {{10, 32}, {5, 64}};
   LocalPool pool(objects::NO_OBJECT, cfg);
-  auto storeHelper = TmStoreHelper(2, &pool);
+  auto storeHelper = TmStoreHelper(2, pool, timeStamper);
 }