Adapt to new Gaudi monitoring

Adapt to new Gaudi monitoring introduced with gaudi/Gaudi!1112 (merged).

Cherry-pick of !2761 (merged) and a very slimmed down version of !2720 (merged)

The use of EventCountAlg is reduced heavily. A simplified EventCountAlg is taken from master (see !2720 (merged)). The changes to tests are kept much less invasive than in !2720 (merged), most notably the "efficiency" provided by EventCountAlg is simply replaced by counting the executions of another algorithm (PrintEventTime).

Also, .gitignore is updated to the one from master.

Goes together with !2800 (merged), Lbcom!510 (merged), Boole!313 (merged), Rec!2229 (merged), Brunel!1079 (merged), Phys!800 (merged), Analysis!706 (merged), DaVinci!440 (merged), Alignment!144 (merged)

Corresponding MRs to master: !2761 (merged), Lbcom!506 (merged), Boole!312 (merged), Rec!2209 (merged), Brunel!1074 (merged), Phys!796 (merged), Analysis!701 (merged), DaVinci!433 (merged)