PerfMonAna+RootUtils: delete duplicate root_pickle module

Remove two out of three copies of this module. PyAnalysisUtils contains the remaining version.

cc @ssnyder

added full-unit-tests label

This merge request affects 2 packages:

• Control/PerformanceMonitoring/PerfMonAna
• Control/RootUtils

Affected files list will not be printed in this case

Adding @amete ,@ssnyder as watchers

added Core analysis-review-required main review-pending-level-1 labels

CI Result SUCCESS (hash 62f3f97e)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 8208] (remote access info)

Delete duplicate module, approving from analysis side. Tong (AR)

removed analysis-review-required label

added analysis-review-approved label

removed review-pending-level-1 label

added review-approved label

mentioned in commit c902a273

merged