tauMonitoring: Move calls to TriggerDecisionTool outside of the for-loop
This MR moves the calls to TriggerDecisionTool from inside the for-loop over taus to outside (and simplifies the ToolHandle
access while at it). This should help w/ the concurrency issue reported in ATLASRECTS-6579. Let me tag @martindl in case he wants to take a look.
Closes ATLASRECTS-6579