PerfMonComps: Enable flake8

This MR is a follow-up to !38852 (merged) and relates to ATEAM-678. We're enabling flake8 for the python modules and scripts under Control/PerformanceMonitoring/PerfMonComps. No new functionality is introduced. There is a minor bug-fix in the way PerfMonSvc obtains the list of algorithms. For example, in q431 the number of algorithms running were being reported to be zero:

Py:PerfMonSvc        INFO job had [0] algorithms

now this is corrected:

Py:PerfMonSvc        INFO job had [377] algorithms

This merge request affects 1 package:

• Control/PerformanceMonitoring/PerfMonComps

This merge request affects 14 files:

• Control/PerformanceMonitoring/PerfMonComps/CMakeLists.txt
• Control/PerformanceMonitoring/PerfMonComps/python/DomainsRegistry.py
• Control/PerformanceMonitoring/PerfMonComps/python/JobOptCfg.py
• Control/PerformanceMonitoring/PerfMonComps/python/MTJobOptCfg.py
• Control/PerformanceMonitoring/PerfMonComps/python/PMonSD.py
• Control/PerformanceMonitoring/PerfMonComps/python/PerfMonFlags.py
• Control/PerformanceMonitoring/PerfMonComps/python/PerfMonSerializer.py
• Control/PerformanceMonitoring/PerfMonComps/python/PyComps.py
• Control/PerformanceMonitoring/PerfMonComps/python/PyMonUtils.py
• Control/PerformanceMonitoring/PerfMonComps/python/PyPerfMon.py
• Control/PerformanceMonitoring/PerfMonComps/share/FastMon.py
• Control/PerformanceMonitoring/PerfMonComps/share/FullMon.py
• Control/PerformanceMonitoring/PerfMonComps/share/PerfMonMTSvc_jobOptions.py
• Control/PerformanceMonitoring/PerfMonComps/share/PerfMonSvc_jobOptions.py

Adding @amete ,@ssnyder as watchers

added Core master review-pending-level-1 labels

CI Result SUCCESS (hash a74b1112)

	Athena	AthSimulation	AthGeneration	AnalysisBase
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
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 25234]

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

merged

mentioned in commit d16f281f

added sweep:ignore label