TrigP1Test: Enable PerfMon in athenaHLT ART tests

Thanks to the fixes done in !29082 (merged), athenaHLT --perfmon now works fine and we can use it to monitor memory usage in TrigP1Test ART tests. Once this change is merged, we should get similar memory plots in the Trigger ART Monitor webpage for TrigP1Test as we get for packages running offline athena tests, for example:
http://test-atrvshft.web.cern.ch/test-atrvshft/ART_monitor/Monitor/Build/2020-01-06T2131/master_Athena_x86_64-centos7-gcc8-opt?package=TrigUpgradeTest&comparisonTo=0

Jira: ATR-19462

This merge request affects 2 packages:

• Trigger/TrigValidation/TrigP1Test
• Trigger/TrigValidation/TrigValTools

Adding @hartj ,@jpanduro as watchers

added Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash 7a5700e9)

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 7834]

The MR looks fine, approving. Pienpen (L1)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 36505d5a

added sweep:ignore label