[cmake] Only print TBB found msg when first found

The package is found with QUIET but when found a msg is printed.
However this message was always printed when find_package(TBB) is
called, even when it was already found before leading to multiple
duplicate outputs in the log.

cmake/modules/FindTBB.cmake

@@ -54,6 +54,11 @@ set_package_properties("TBB" PROPERTIES
   URL "https://github.com/oneapi-src/oneTBB"
 )
 
+# check if TBB was already found
+if(TBB_FOUND AND TARGET TBB::tbb)
+  return()
+endif()
+
 # first, try to find TBBs cmake configuration
 find_package(TBB ${TBB_FIND_VERSION} QUIET CONFIG)
 if(TBB_FOUND AND TARGET TBB::tbb)