Removing warnings related to FTAG histograms in jet trigger monitoring

This MR removes some warnings that appeared in the jet trigger monitoring when it is attempted to add the same histograms more than once. I did a quick check that the histograms still appear and fill the same entries.

Reported in ATLASRECTS-7222

This merge request affects 1 package:

• Trigger/TrigMonitoring/TrigJetMonitoring

This merge request affects 1 file:

• Trigger/TrigMonitoring/TrigJetMonitoring/python/TrigJetMonitorAlgorithm.py

Adding @jgeisen ,@ayana ,@valentem ,@cantel as watchers

added 22.0 DQ JetEtmiss Trigger TriggerJet review-pending-level-1 labels

CI Result SUCCESS (hash 7c786316)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 60807]

Approved
Albert (L1)

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

added review-approved-tier0 label

added review-approved-point1 label

merged

mentioned in commit 203ed94b