Support oneTBB

With the changes in this MR I have been able to run successfully the avalanche scheduler tests that were failing in !1470 (closed) with an older version of TBB (2020.3) and a newer one (oneTBB, 2021.10 which is not from 2021 but was released a few months ago). I also checked that changing the number of threads passed to the AvalancheSchedulerSvc is indeed in effect since it was related to one of the changes when initializing task_arena.

Fixes #270 (closed)

Supersedes !1470 (closed)

GaudiHive/src/AvalancheSchedulerSvc.h

@@ -117,9 +117,6 @@ public:
   /// Constructor
   using extends::extends;
 
-  /// Destructor
-  ~AvalancheSchedulerSvc() noexcept override {}
-
   /// Initialise
   StatusCode initialize() override;